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

Execution · Practiced Mastery
The 3DS Mario Kart that added gliders, underwater driving, and kart customisation.

Execution · Practiced Mastery
A cover-shooter Rainbow Six blending tactical room-clearing with solid gunplay.
Mario Kart 7 leans Execution (Practiced Mastery); Tom Clancy's Rainbow Six: Vegas 2 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 7
Drift boosts, gliding, and underwater control
Tom Clancy's Rainbow Six: Vegas 2
Cover-based gunfights still punish poor aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 7
Online lobbies reward anticipating rivals' items
Tom Clancy's Rainbow Six: Vegas 2
Multiplayer brings some human adaptation; AI is scripted
Mario Kart 7 leans a little harder on variance, though the gap is small.
Mario Kart 7
Item luck shapes every race
Tom Clancy's Rainbow Six: Vegas 2
Enemy placements partially unknown per encounter
Tom Clancy's Rainbow Six: Vegas 2 leans a little harder on optimization, though the gap is small.
Mario Kart 7
Kart customisation and track-specific routes
Tom Clancy's Rainbow Six: Vegas 2
Room-clearing order and squad commands are solvable tactics
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.