head to head
StarCraft asks more than Street Fighter X Tekken, and the gap is optimization.

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

Execution · Grand Arena
A tag-team crossover fighter pitting Street Fighter's cast against Tekken's under Capcom rules.
StarCraft leans Optimization (Grand Arena); Street Fighter X Tekken leans Execution (Grand Arena).
Street Fighter X Tekken leans a little harder on execution, though the gap is small.
StarCraft
APM and micro control ceiling is huge
Street Fighter X Tekken
Tag combos and juggle timing demand practiced hands
Street Fighter X Tekken leans a little harder on reads, though the gap is small.
StarCraft
scouting and predicting human opponent builds
Street Fighter X Tekken
Human mixups and tag baits require adaptation
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
Street Fighter X Tekken
Deterministic aside from negligible elements
StarCraft leans clearly harder on optimization.
StarCraft
build orders and economy are near-solvable
Street Fighter X Tekken
Gem loadouts and team synergy add a builder layer
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.