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 · Practiced Mastery
A classic beat 'em up sequel where the Lee brothers avenge Marian with kicks and knees.

Execution · Practiced Mastery
Kiting scripted alien swarms with top-down aim and upgrade planning.
Double Dragon II: The Revenge leans Execution (Practiced Mastery); Shadowgrounds Survivor leans Execution (Practiced Mastery).
Double Dragon II: The Revenge leans a little harder on execution, though the gap is small.
Double Dragon II: The Revenge
Directional attacks and knee timing carry every fight
Shadowgrounds Survivor
Kiting alien swarms with top-down aim is the core demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Double Dragon II: The Revenge
Enemy thugs use fixed AI routines
Shadowgrounds Survivor
Aliens charge on simple scripted aggression
Shadowgrounds Survivor leans a little harder on variance, though the gap is small.
Double Dragon II: The Revenge
Minor enemy positioning randomness
Shadowgrounds Survivor
Spawn waves vary slightly in survival mode
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Double Dragon II: The Revenge
Learning stage layouts and abusing the hyper knee
Shadowgrounds Survivor
Weapon upgrade order and positioning reward planning
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.