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.
League of Legends is the harder of the two for you, by 1.5 points. The gap is widest on obscurity, where League of Legends asks considerably more than Age of Empires II: Definitive Edition. If you want the gentler run, start with Age of Empires II: Definitive Edition.
Axis by axis, biggest gap first
LEAGUE OF LEGENDS
A hundred and seventy champions, each with four abilities you are expected to know the cooldowns of, and the tutorial covers none of it.
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.