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

Optimization · Practiced Mastery
A space-strategy adventure mixing ship combat with empire resource management.

Optimization · Practiced Mastery
Planning a raid in advance, then executing it where one mistake kills.
Star Control 3 leans Optimization (Practiced Mastery); Tom Clancy's Rainbow Six leans Optimization (Practiced Mastery).
Tom Clancy's Rainbow Six leans a little harder on execution, though the gap is small.
Star Control 3
Ship melee combat needs decent aim and maneuvering
Tom Clancy's Rainbow Six
One bullet kills, so entries demand clean aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Star Control 3
AI captains use fixed tactics; some PvP melee allows prediction
Tom Clancy's Rainbow Six
Multiplayer raids add human counterplay
Star Control 3 leans a little harder on variance, though the gap is small.
Star Control 3
Exploration and resource discovery are scripted-but-unknown
Tom Clancy's Rainbow Six
Terrorist placements are unknown until doors open
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Star Control 3
Fleet building, colonization and resource management drive progress
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.