head to head
Ready or Not asks more than Tom Clancy's Rainbow Six: Vegas, and the gap is variance.

Execution · Pure Mechanics
Tactical SWAT shooter with lethal TTK.

Execution · Competitive PvP
Tactical gunfights testing aim, entry planning and prediction of human opponents online.
Ready or Not leans Execution (Pure Mechanics); Tom Clancy's Rainbow Six: Vegas leans Execution (Competitive PvP).
Ready or Not leans a little harder on execution, though the gap is small.
Ready or Not
Lethal TTK and recoil punish slop
Tom Clancy's Rainbow Six: Vegas
Aim and snap-to-cover gunplay punish slow hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Ready or Not
Mostly scripted suspects, limited reads
Tom Clancy's Rainbow Six: Vegas
Multiplayer angles and pushes demand reading human opponents
Ready or Not leans clearly harder on variance.
Ready or Not
Suspect placement and AI behavior varies
Tom Clancy's Rainbow Six: Vegas
Terrorist hunt spawns vary modestly between runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Ready or Not
Loadouts, breaching tools, team plans
Tom Clancy's Rainbow Six: Vegas
Room-entry planning and map knowledge are studyable
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.