head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Competitive PvP
Tactical gunfights testing aim, entry planning and prediction of human opponents online.

Execution · Competitive PvP
Beloved PS2 wrestler combining fast arcade grappling with body-part damage and deep rosters.
Tom Clancy's Rainbow Six: Vegas leans Execution (Competitive PvP); WWE SmackDown! Here Comes the Pain leans Execution (Competitive PvP).
Tom Clancy's Rainbow Six: Vegas leans a little harder on execution, though the gap is small.
Tom Clancy's Rainbow Six: Vegas
Aim and snap-to-cover gunplay punish slow hands
WWE SmackDown! Here Comes the Pain
Fast grapple chains and counter timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Tom Clancy's Rainbow Six: Vegas
Multiplayer angles and pushes demand reading human opponents
WWE SmackDown! Here Comes the Pain
Versus play rewards predicting counter attempts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Tom Clancy's Rainbow Six: Vegas
Terrorist hunt spawns vary modestly between runs
WWE SmackDown! Here Comes the Pain
Minor random elements in matches
Tom Clancy's Rainbow Six: Vegas leans a little harder on optimization, though the gap is small.
Tom Clancy's Rainbow Six: Vegas
Room-entry planning and map knowledge are studyable
WWE SmackDown! Here Comes the Pain
Body-damage targeting and move knowledge are learnable
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.