head to head
Tom Clancy's Rainbow Six asks more than Grand Theft Auto: San Andreas, and the gap is reads.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Optimization · Practiced Mastery
Planning a raid in advance, then executing it where one mistake kills.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Tom Clancy's Rainbow Six leans Optimization (Practiced Mastery).
Tom Clancy's Rainbow Six leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Tom Clancy's Rainbow Six
One bullet kills, so entries demand clean aim
Tom Clancy's Rainbow Six leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Tom Clancy's Rainbow Six
Multiplayer raids add human counterplay
Tom Clancy's Rainbow Six leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Tom Clancy's Rainbow Six
Terrorist placements are unknown until doors open
Tom Clancy's Rainbow Six leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Tom Clancy's Rainbow Six
The pre-mission planning phase is the real game
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.