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.

Execution · Pure Mechanics
A cover-based run-and-gun testing precise shooting and pattern memorization.

Execution · Practiced Mastery
A modern beat-em-up where precise combo execution and enemy-pattern mastery are the skill ceiling.
Rolling Thunder 2 leans Execution (Pure Mechanics); Streets of Rage 4 leans Execution (Practiced Mastery).
Rolling Thunder 2 leans a little harder on execution, though the gap is small.
Rolling Thunder 2
Precise shooting, cover-jumping and timing carry every stage
Streets of Rage 4
Precise combo strings, parry timing, and star-move usage are decisive
Streets of Rage 4 leans a little harder on reads, though the gap is small.
Rolling Thunder 2
Solo/co-op - enemies follow scripted spawn patterns
Streets of Rage 4
Enemies use scripted attack patterns; no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Rolling Thunder 2
Enemy appearances are fixed once memorized
Streets of Rage 4
Enemy arrangement is largely fixed; minimal RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Rolling Thunder 2
Learning spawn points and weapon management is the meta-game
Streets of Rage 4
Character selection, route sequencing, and score management reward study
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.