head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Competitive PvP
Out-executing and out-predicting another human in frame-precise duels.

Execution · Competitive PvP
The 3D fighting series opener where execution and human mind-games decide every round.
Super Street Fighter IV: 3D Edition leans Execution (Competitive PvP); Tekken leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Super Street Fighter IV: 3D Edition
Links, anti-airs and motion inputs gate every level of play
Tekken
Frame-tight inputs, juggle combos, movement demand trained hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Super Street Fighter IV: 3D Edition
Footsies and conditioning a human opponent decide matches
Tekken
Human opponent adapts; throws, lows, sidesteps form mixup mind-games
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Super Street Fighter IV: 3D Edition
Almost fully deterministic once inputs land
Tekken
No hidden info; only matchup unfamiliarity early on
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Super Street Fighter IV: 3D Edition
Frame data, matchup knowledge and punish routes underpin everything
Tekken
Frame data, punishes, and combo routing are studyable 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.