head to head
Warcraft III: Reign of Chaos asks more than Street Fighter X Tekken, and the gap is variance.

Execution · Grand Arena
A tag-team crossover fighter pitting Street Fighter's cast against Tekken's under Capcom rules.

Optimization · Grand Arena
Blizzard's hero-centric RTS where build-order theory meets surgical unit micro against humans.
Street Fighter X Tekken leans Execution (Grand Arena); Warcraft III: Reign of Chaos leans Optimization (Grand Arena).
Street Fighter X Tekken leans a little harder on execution, though the gap is small.
Street Fighter X Tekken
Tag combos and juggle timing demand practiced hands
Warcraft III: Reign of Chaos
Micro of heroes and units decides fights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter X Tekken
Human mixups and tag baits require adaptation
Warcraft III: Reign of Chaos
Scouting and out-guessing a human opponent's tech
Warcraft III: Reign of Chaos leans clearly harder on variance.
Street Fighter X Tekken
Deterministic aside from negligible elements
Warcraft III: Reign of Chaos
Creep routes and item drops add randomness
Warcraft III: Reign of Chaos leans clearly harder on optimization.
Street Fighter X Tekken
Gem loadouts and team synergy add a builder layer
Warcraft III: Reign of Chaos
Build orders, creeping routes, and matchup theory run deep
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.