Why did God the Father choose suffering for Christ and not the lucrative reigning power of an emperor of this world? My witness to suffering can be elaborated by the following poem written by me. I am attaching this poem because I believe this poem a witness to my long journey with my cross assures me that I am following Christ's wishes but leaves a question unanswered. I have asked that small question at the end of the poem. I hope somebody here can answer that and help me understand God the Father well from a Catholic perspective.


  Adoration at Golgotha
  
  By mvr950
  
  Adoration began.
  
  Adoree before the adored.
  
  Before the exposed monstrance.
  
  People cry out to Heaven.
  
  For a drop of Holy Water.
  
  The night deludes them.
  
  To take the route to Satan’s
  
  quiver and crescendo.
  
  I deny myself to take that path.
  
  I reject to take that false pathos.
  
  Because I have the cross of Christ
  
  living within me.
  
  I have taken up a fraction of an
  
  infinitesimally small fraction
  
  of His suffering.
  
  He has given me tiniest but
  
  impossible to carry a cross.
  
  I prostrate before Him.
  
  Genuflect before Him.
  
  Kneel down on the pew
  
  so a crowbar cannot lift me up.
  
  I lay before Him.
  
  I kiss His bloody feet at Golgotha
  
  as I am crucified along with Him.
  
  The rebuke, the mockery, the rebuttal,
  
  the screams, the cries, the smirks
  
  all are pointed at Him and me.
  
  I gave up my last drop of dignity
  
  only for Christ.
  
  Only for God the son.
  
  Only for the son of man.
  
  In Him, I live.
  
  He requested me to carry the cross.
  
  And I give my all
  
  only for Him.
  
  I know, in Him I will find
  
  the truth, life, and the light.
  
  I believe God will separate
  
  the harvest from the chaffs.
  
  Cause He is the Just God.
  
  Our lust for power
  
  will find the last meaning
  
  at the end of the epitaph
  
  engraved on the tombstone.
  
  Our sins of the flesh
  
  will be crushed by the holy stature of God.
  
  And we will hear those sweet condescending words
  
  This is the Domus Dei Omnipotentis. Come and join us.


Now God chose Christ to die on the cross. And give suffering meaning. Now my question is Can't God the Father choose Christ to come in reigning power as an emperor of the world to become a savior? Why did God the Father choose suffering for Christ instead?

It must be God the Father. Because Jesus at Gethsemani said, "Abba, Father if it were possible, take this chalice away from me. But not what I will what thou wilt." And on the Cross Jesus said, "Eli Eli Lama Sabachthani". "My God, My God why have you forsaken me?"
Jesus told us the answer when explained three things:


What is God's chief motivation?
What is the greatest expression of that motivation?
Who are the disciples?


First, God's chief motivation is love:


  36 “Teacher, which is the greatest commandment in the Law?”
  
  37 Jesus replied: “‘Love the Lord your God with all your heart and
  with all your soul and with all your mind.’[c] 38 This is the first
  and greatest commandment. (Matthew 22:36-37)


Second, the greatest expression of love is to lay your life down for your friends:


  9 “As the Father has loved me, so have I loved you. Now remain in my
  love. 10 If you keep my commands, you will remain in my love, just as
  I have kept my Father’s commands and remain in his love. 11 I have
  told you this so that my joy may be in you and that your joy may be
  complete. 12 My command is this: Love each other as I have loved you.
  13 Greater love has no one than this: to lay down one’s life for
  one’s friends. (John 15:9-13)


Third, Jesus declares the disciples are his friends:


  14 You are my friends if you do what I command. 15 I no longer
  call you servants, because a servant does not know his master’s
  business. Instead, I have called you friends, for everything that
  I learned from my Father I have made known to you. 16 You did not
  choose me, but I chose you and appointed you so that you might go and
  bear fruit—fruit that will last—and so that whatever you ask in my
  name the Father will give you. 17 This is my command: Love each other.
  (John 15:14-17)


We know of soldiers, firemen, parents, and police who have laid down their life for people they loved. Are they greater than God? No! Thus if God values love and is the greatest lover in the universe and that love requires giving your life for those you love and you have picked people to call friends, you must do as Jesus did.

As for the false choice, Jesus will return to reign as emperor of the world. However, when he does, the time for mercy will have passed; he will come to judge the living and the dead. It is for the sake of sinners who need time to repent that Jesus delays his return, so that as many may be saved as possible.

However, since you are a poet, a fitting response is found in one of God's greatest poems, Job. As you read this, having heard all the things that Leviathan will NOT do for you, understand that the point of this speech is to declare what God WILL do for you!

41 “Can you pull in Leviathan with a fishhook
    or tie down its tongue with a rope?
2 Can you put a cord through its nose
    or pierce its jaw with a hook?
3 Will it keep begging you for mercy?
    Will it speak to you with gentle words?
4 Will it make an agreement with you
    for you to take it as your slave for life?
5 Can you make a pet of it like a bird
    or put it on a leash for the young women in your house?
6 Will traders barter for it?
    Will they divide it up among the merchants?
7 Can you fill its hide with harpoons
    or its head with fishing spears?
8 If you lay a hand on it,
    you will remember the struggle and never do it again!
9 Any hope of subduing it is false;
    the mere sight of it is overpowering.
10 No one is fierce enough to rouse it.
    Who then is able to stand against me?
11 Who has a claim against me that I must pay?
    Everything under heaven belongs to me.


Jesus was tied up, was pierced, does speak tenderly, does make a covenant to serve us, his garments were bartered away, and his side was thrust through with a spear. On the flip side, Leviathan represents the evil world system (and its head, Satan), an empire of force that dominates the World for evil. That is something God did not want for his Son. Leviathan will be destroyed, and its end is written of in Revelation 13. Jesus' empire will be different, because the master will be the servant of all.