Is one move considered as objectively better than another if they both lead to the same result? Here is an example
[FEN &quot;8/3k2PB/q7/8/4K3/8/8/8 w - - 0 1&quot;]

One might intuitively say g8=Q is a much better move than g8=R. However, since they both lead to a draw, should we not conclude that g8=Q is as good as g8=R?
Well, according to [Syzygy endgame tablebases](https://syzygy-tables.info/?fen=8/3k2PB/q7/8/4K3/8/8/8_w_-_-_0_1_, g8=R is a loss in 63 plies and g8=Q is a draw.  So g8=Q is definitely better.