head to head
Valorant asks more than Tom Clancy's Rainbow Six: Vegas, and the gap is execution.

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

Execution · Grand Arena
A tactical hero shooter decided by aim duels and adapting to human opponents.
Tom Clancy's Rainbow Six: Vegas leans Execution (Competitive PvP); Valorant leans Execution (Grand Arena).
Valorant leans clearly harder on execution.
Tom Clancy's Rainbow Six: Vegas
Aim and snap-to-cover gunplay punish slow hands
Valorant
One-tap aim and crosshair placement decide most duels.
Valorant leans clearly harder on reads.
Tom Clancy's Rainbow Six: Vegas
Multiplayer angles and pushes demand reading human opponents
Valorant
Humans constantly adapt peeks, fakes, and ability timings.
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
Valorant
Light spray RNG and unknown enemy positions.
Valorant 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
Valorant
Agent comps, util usage, and economy are studyable theory.
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.