Head to head
Which one will break you first?
Two fingerprints on one grid. Both are scored through your profile, so this answers the question for you rather than for the average player.
I Wanna Be the Guy is the harder of the two for you, by 1.8 points. The gap is widest on strategy, where Age of Empires II: Definitive Edition asks considerably more than I Wanna Be the Guy. If you want the gentler run, start with Age of Empires II: Definitive Edition.
Axis by axis, biggest gap first
I WANNA BE THE GUY
Built on traps that cannot be seen coming the first time, so progress is memorising your own deaths. The save points are the only concession it makes.
The game is the antagonist. Good luck.
AGE OF EMPIRES II: DEFINITIVE EDITION
Build orders are the curve, and the campaigns teach almost none of what the game actually asks for. The hard AI does not forget its economy while it fights.
Sustained pressure. Progress is earned.