What is the most sound, yet still sharp, gambit? I have played chess seriously for a little over a year and my style is an aggressive one. I started off playing really dubious gambits (at least in my opinion) like the King's Gambit and the Latvian Gambit, immediately looking to give away material for active play right from the opening. I have since toned down my aggressiveness, preferring much more quiet openings like the Ruy Lopez and the Pirc. I really want to re-ignite my gambit play and I need some suggestions on sound gambits I could go for and why.
The Evans Gambit is probably one of the most sound. It's still occasionally played at GM level and most of the critical lines are rarely if ever tested.
The Vienna Gambit and Blackmar–Diemer are probably playable. The Scotch gambit is playable although I wouldn't be surprised if there isn't a forced draw.
With black the Benko is probably sound and the Budapest is playable. Black has fewer sound gambit options since black starts out a half tempo down. Giving up a pawn for a move just gives you an equal position but you're down a pawn.
I'll add though that virtually any opening is playable below 2000 level and certainly in rapid or blitz. In fact, you could probably get to around 2300 with any normal openings.