head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Pure Mechanics
High-speed aim and movement dominance against human opponents fighting for weapon and map control.

Execution · Pure Mechanics
A fast arena shooter where twitch aim and movement against human opponents is everything.
Unreal Tournament (1999) leans Execution (Pure Mechanics); Unreal Tournament 2003 leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Unreal Tournament (1999)
Shock combo and flak cannon timing demand peak motor precision
Unreal Tournament 2003
aim and movement speed decide duels
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Unreal Tournament (1999)
Human opponents continuously adapt routes and engagement choices
Unreal Tournament 2003
predicting human opponent positioning
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Unreal Tournament (1999)
Map spawns are minor; most information is visible or predictable
Unreal Tournament 2003
weapon and pickup spawns vary
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Unreal Tournament (1999)
Weapon prioritisation and map control are learnable but secondary
Unreal Tournament 2003
map control and item timing solvable
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.