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

Execution · Practiced Mastery
The fastest mainline Souls, distilling the formula into aggressive boss duels.

Execution · Practiced Mastery
A Tetris variant testing placement speed with a square-building scoring layer.
Dark Souls III leans Execution (Practiced Mastery); The New Tetris leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Souls III
fast roll timing against aggressive scripted bosses
The New Tetris
Fast precise placement under speed is the lead axis
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Souls III
PvP invasions exist but are optional
The New Tetris
Multiplayer adds light prediction, mostly solo speed
The New Tetris leans a little harder on variance, though the gap is small.
Dark Souls III
fixed encounters converge after first sight
The New Tetris
Piece bag is random but bounded and mappable
Dark Souls III leans a little harder on optimization, though the gap is small.
Dark Souls III
movesets and builds are fully mappable
The New Tetris
Building 4x4 squares for bonus rewards deeper strategy
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.