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

Optimization · Practiced Mastery
Building bean chains fast under random pieces and garbage pressure.

Optimization · Practiced Mastery
Planning a raid in advance, then executing it where one mistake kills.
Dr. Robotnik's Mean Bean Machine leans Optimization (Practiced Mastery); Tom Clancy's Rainbow Six leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dr. Robotnik's Mean Bean Machine
Placement speed under garbage pressure decides late stages
Tom Clancy's Rainbow Six
One bullet kills, so entries demand clean aim
Tom Clancy's Rainbow Six leans a little harder on reads, though the gap is small.
Dr. Robotnik's Mean Bean Machine
Versus humans, anticipating chain timing adds an edge
Tom Clancy's Rainbow Six
Multiplayer raids add human counterplay
Dr. Robotnik's Mean Bean Machine leans a little harder on variance, though the gap is small.
Dr. Robotnik's Mean Bean Machine
Random bean colours shape every match
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.
Dr. Robotnik's Mean Bean Machine
Chain-building structure knowledge is the core skill
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.