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
Tetris extended into 3D - spatial packing optimization executed under accelerating pressure.

Execution · Pure Mechanics
Comic-panel beat 'em up notorious for punishing health drain and tough fights.
Blockout leans Execution (Practiced Mastery); Comix Zone leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Blockout
Rotating polycubes on three axes under time pressure strains hands
Comix Zone
Brutal one-life brawling demands clean play
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Blockout
Solo pit - nothing to predict
Comix Zone
Enemies follow fixed attack scripts
Blockout leans a little harder on variance, though the gap is small.
Blockout
Piece sequence is random but quickly bounded
Comix Zone
Everything is placed and scripted
Blockout leans a little harder on optimization, though the gap is small.
Blockout
3D packing has optimal layer-clearing patterns to internalise
Comix Zone
Panel routes and item use are memorizable
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.