head to head
Virtua Fighter 5: Final Showdown asks more than Ultimate Marvel vs. Capcom 3, and the gap is optimization.

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

Execution · Grand Arena
Often called the most pure expression of high-level 3D fighting, built almost entirely on frame-data optimisation and throw-tech reads.
Ultimate Marvel vs. Capcom 3 leans Execution (Grand Arena); Virtua Fighter 5: Final Showdown leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Ultimate Marvel vs. Capcom 3
Long touch-of-death combos demand elite hands
Virtua Fighter 5: Final Showdown
Precise evade directions and just-frame throws set a high execution standard
Virtua Fighter 5: Final Showdown leans a little harder on reads, though the gap is small.
Ultimate Marvel vs. Capcom 3
Mixups and assist baits versus adapting humans
Virtua Fighter 5: Final Showdown
Throw-tech guessing and opponent tendency exploitation are the core loop
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
Virtua Fighter 5: Final Showdown
No RNG; all information is transparent
Virtua Fighter 5: Final Showdown leans clearly harder on optimization.
Ultimate Marvel vs. Capcom 3
Team composition and matchup knowledge run deep
Virtua Fighter 5: Final Showdown
Throw-tech rates, evade directions, and frame data are extensively studied
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.