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 3D fighter where movement and mixup reads decide rounds.

Execution · Grand Arena
A tag-team 3D fighter layering team optimization onto Tekken's execution and reads core.
Tekken 8 leans Execution (Grand Arena); Tekken Tag Tournament leans Execution (Grand Arena).
Tekken 8 leans a little harder on execution, though the gap is small.
Tekken 8
Just-frame inputs and 3D movement punish sloppy hands.
Tekken Tag Tournament
Tag combos and netsu juggles demand precise inputs
Tekken 8 leans a little harder on reads, though the gap is small.
Tekken 8
Adaptive opponents mix lows, highs, and throws.
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.
Tekken 8
Negligible RNG in core matches.
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.
Tekken 8
Frame data, punishes, and movelist depth.
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.