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 · Practiced Mastery
A platform of millions of user-created multiplayer games spanning every genre, played mostly by younger audiences.

Execution · Competitive PvP
Reversal timing and grapple guessing games in a famously buggy wrestling package.
Roblox leans Execution (Practiced Mastery); WWE 2K20 leans Execution (Competitive PvP).
WWE 2K20 leans a little harder on execution, though the gap is small.
Roblox
Many popular experiences are obby/PvP tests of hands
WWE 2K20
Reversal timing windows decide matches but inputs stay forgiving
WWE 2K20 leans a little harder on reads, though the gap is small.
Roblox
Multiplayer experiences pit you against other kids' minds
WWE 2K20
Human opponents bait reversals and mix grapple choices
Roblox leans a little harder on variance, though the gap is small.
Roblox
User-generated content means constant unknown systems
WWE 2K20
Notorious bugs add chaos; systems otherwise deterministic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Roblox
Grind economies and trading reward system mastery
WWE 2K20
Move-set knowledge and stamina management give an edge
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.