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.
Age of Empires II: Definitive Edition is the harder of the two for you, by 0.9 points. The gap is widest on grind, where Age of Empires II: Definitive Edition asks considerably more than Alien: Isolation. If you want the gentler run, start with Alien: Isolation.
Axis by axis, biggest gap first
ALIEN: ISOLATION
It barely tests your hands at all and is one of the most punishing games here anyway: saving takes ten seconds at a fixed terminal and can be interrupted, so every stretch of progress is a bet you are choosing to hold.
Real resistance. Expect to work for it.
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.