head to head
Street Fighter III: 3rd Strike asks more than Tekken Tag Tournament, and the gap is reads.

Reads · Competitive PvP
A parry system that elevates reads to the central skill axis, with execution demands that remain punishing decades later.

Execution · Grand Arena
A tag-team 3D fighter layering team optimization onto Tekken's execution and reads core.
Street Fighter III: 3rd Strike leans Reads (Competitive PvP); Tekken Tag Tournament leans Execution (Grand Arena).
Street Fighter III: 3rd Strike leans a little harder on execution, though the gap is small.
Street Fighter III: 3rd Strike
SA combo links and precise parry timing set an extreme execution ceiling
Tekken Tag Tournament
Tag combos and netsu juggles demand precise inputs
Street Fighter III: 3rd Strike leans clearly harder on reads.
Street Fighter III: 3rd Strike
Parry is a pure real-time read against an adapting human - the defining mechanic
Tekken Tag Tournament
Tag timing adds another layer of human mind-games
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter III: 3rd Strike
No RNG; all information is transparent
Tekken Tag Tournament
Open information; nothing hidden between rounds
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter III: 3rd Strike
Super Art selection and character punish routing are well-studied
Tekken Tag Tournament
Team synergy and tag combo routing are optimizable systems
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.