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.

Reads · Competitive PvP
An anime fighting game packing JoJo's whole cast into stylish one-on-one duels.

Execution · Grand Arena
A tag-team 3D fighter layering team optimization onto Tekken's execution and reads core.
JoJo's Bizarre Adventure: All-Star Battle R leans Reads (Competitive PvP); Tekken Tag Tournament leans Execution (Grand Arena).
Tekken Tag Tournament leans a little harder on execution, though the gap is small.
JoJo's Bizarre Adventure: All-Star Battle R
Combo execution and punish timing matter
Tekken Tag Tournament
Tag combos and netsu juggles demand precise inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
JoJo's Bizarre Adventure: All-Star Battle R
Human opponents adapt every round, classic fighter mind games
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.
JoJo's Bizarre Adventure: All-Star Battle R
Full information once matchups are known
Tekken Tag Tournament
Open information; nothing hidden between rounds
Tekken Tag Tournament leans a little harder on optimization, though the gap is small.
JoJo's Bizarre Adventure: All-Star Battle R
Frame data, matchup knowledge, optimal punishes
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.