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 · Competitive PvP
Weapon-spacing execution and live conditioning battles against human opponents.

Execution · Competitive PvP
The 3D fighting series opener where execution and human mind-games decide every round.
SoulCalibur V leans Execution (Competitive PvP); Tekken leans Execution (Competitive PvP).
Tekken leans a little harder on execution, though the gap is small.
SoulCalibur V
Spacing, step timing and just-frame inputs reward trained hands
Tekken
Frame-tight inputs, juggle combos, movement demand trained hands
Tekken leans a little harder on reads, though the gap is small.
SoulCalibur V
Versus humans, conditioning and throw-versus-mid guessing decides rounds
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.
SoulCalibur V
Nothing hidden beyond the opponent's intent
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.
SoulCalibur V
Frame data, matchup study and ring positioning are deep homework
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.