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

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

Execution · Grand Arena
A classic football simulation with tactical team management.
Tom Clancy's Rainbow Six: Vegas leans Execution (Competitive PvP); Winning Eleven: Pro Evolution Soccer 2007 leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Tom Clancy's Rainbow Six: Vegas
Aim and snap-to-cover gunplay punish slow hands
Winning Eleven: Pro Evolution Soccer 2007
passing/shooting timing needs real precision
Winning Eleven: Pro Evolution Soccer 2007 leans a little harder on reads, though the gap is small.
Tom Clancy's Rainbow Six: Vegas
Multiplayer angles and pushes demand reading human opponents
Winning Eleven: Pro Evolution Soccer 2007
human opponents adapt tactics against you
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
Winning Eleven: Pro Evolution Soccer 2007
minor ball-physics randomness
Winning Eleven: Pro Evolution Soccer 2007 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
Winning Eleven: Pro Evolution Soccer 2007
tactics and formations are learnable systems
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.
full breakdown
Tom Clancy's Rainbow Six: Vegas →
full breakdown
Winning Eleven: Pro Evolution Soccer 2007 →