head to head
Rainbow Six Siege asks more than Command & Conquer: Generals, and the gap is reads.

Reads · Grand Arena
Modern-warfare RTS with general-specific powers where faction counters and production efficiency are central.

Reads · Grand Arena
A tactical breach-and-defend shooter driven by mind games over angles and gadgets.
Command & Conquer: Generals leans Reads (Grand Arena); Rainbow Six Siege leans Reads (Grand Arena).
Rainbow Six Siege leans a little harder on execution, though the gap is small.
Command & Conquer: Generals
Supply drop timing and unit special abilities require precise activation
Rainbow Six Siege
Crisp aim required but TTK is unforgiving.
Rainbow Six Siege leans clearly harder on reads.
Command & Conquer: Generals
Three-faction asymmetry and general powers must be predicted constantly
Rainbow Six Siege
Defenders adapt holds; attackers fake and bait.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer: Generals
Supply depot placement is map-fixed; minimal in-game RNG
Rainbow Six Siege
Site rotations only; loadouts deterministic.
Command & Conquer: Generals leans a little harder on optimization, though the gap is small.
Command & Conquer: Generals
General power sequencing and unit composition are well-solvable
Rainbow Six Siege
Operator picks, gadget placement, and utility usage.
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.