head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Grand Arena
A 3D fighter built on the 3-way triangle system where Break Hold reads and combo execution drive competitive play.

Execution · Grand Arena
A tag-team crossover fighter pitting Street Fighter's cast against Tekken's under Capcom rules.
Dead or Alive 6 leans Execution (Grand Arena); Street Fighter X Tekken leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dead or Alive 6
Triangle system strings and break blow setups require practiced execution
Street Fighter X Tekken
Tag combos and juggle timing demand practiced hands
Dead or Alive 6 leans a little harder on reads, though the gap is small.
Dead or Alive 6
Break Hold timing and 3-way triangle system reads against humans
Street Fighter X Tekken
Human mixups and tag baits require adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dead or Alive 6
No RNG; all mechanics are transparent
Street Fighter X Tekken
Deterministic aside from negligible elements
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dead or Alive 6
Character matchup knowledge and Break Blow baiting reward study
Street Fighter X Tekken
Gem loadouts and team synergy add a builder layer
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.