head to head
Neither is simply harder - they are hard in different places. Just Act Natural demands more reads; Worms W.M.D demands more execution.

Reads · Pure Mind Games
Behavioural bluffing - mimicking NPCs while human seekers learn your tells.

Reads · Competitive PvP
Modern Worms with crafting and vehicles, keeping the classic turn-based destructible-terrain warfare.
Just Act Natural leans Reads (Pure Mind Games); Worms W.M.D leans Reads (Competitive PvP).
Worms W.M.D leans clearly harder on execution.
Just Act Natural
Walking like an NPC needs restraint, not dexterity
Worms W.M.D
Shot arcs, rope swings and vehicle control demand precision
Just Act Natural leans clearly harder on reads.
Just Act Natural
Out-guessing human seekers and hiders is the whole game
Worms W.M.D
Multiplayer turns hinge on out-guessing rival worm placement
Worms W.M.D leans a little harder on variance, though the gap is small.
Just Act Natural
NPC crowds and tasks add cover noise
Worms W.M.D
Wind, crates and random terrain reshape options
Worms W.M.D leans clearly harder on optimization.
Just Act Natural
Task patterns can be learned but humans counter-adapt
Worms W.M.D
Crafting and weapon budgeting reward planned turns
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.