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 · Grand Arena
A hyper-fast tag fighting game defined by three-character teams and touch-of-death combos.

Reads · Grand Arena
A neutral-focused fighter where managing the GRD gauge against an adapting opponent creates a constant strategic tug-of-war.
Ultimate Marvel vs. Capcom 3 leans Execution (Grand Arena); Under Night In-Birth II Sys:Celes leans Reads (Grand Arena).
Ultimate Marvel vs. Capcom 3 leans a little harder on execution, though the gap is small.
Ultimate Marvel vs. Capcom 3
Long touch-of-death combos demand elite hands
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 a little harder on reads, though the gap is small.
Ultimate Marvel vs. Capcom 3
Mixups and assist baits versus adapting humans
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.
Ultimate Marvel vs. Capcom 3
Almost fully deterministic
Under Night In-Birth II Sys:Celes
No RNG; GRD state is visible information
Under Night In-Birth II Sys:Celes leans a little harder on optimization, though the gap is small.
Ultimate Marvel vs. Capcom 3
Team composition and matchup knowledge run deep
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.