head to head
Neither is simply harder - they are hard in different places. StarCraft demands more optimization; Under Night In-Birth II Sys:Celes demands more reads.

Optimization · Grand Arena
A real-time strategy classic where perfected build orders and mechanical speed decide most matches.

Reads · Grand Arena
A neutral-focused fighter where managing the GRD gauge against an adapting opponent creates a constant strategic tug-of-war.
StarCraft leans Optimization (Grand Arena); Under Night In-Birth II Sys:Celes leans Reads (Grand Arena).
Under Night In-Birth II Sys:Celes leans a little harder on execution, though the gap is small.
StarCraft
APM and micro control ceiling is huge
Under Night In-Birth II Sys:Celes
GRD-boosted combos and precise Chain Shift timing demand real execution
Under Night In-Birth II Sys:Celes leans clearly harder on reads.
StarCraft
scouting and predicting human opponent builds
Under Night In-Birth II Sys:Celes
GRD tug-of-war with a human opponent is persistently adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
StarCraft
minimal hidden info beyond fog of war
Under Night In-Birth II Sys:Celes
No RNG; GRD state is visible information
StarCraft leans clearly harder on optimization.
StarCraft
build orders and economy are near-solvable
Under Night In-Birth II Sys:Celes
GRD management theory and optimal punish routing are well-documented
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.