head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
A gentle licensed adventure testing basic puzzle matching and collectible hunting.

Optimization · Practiced Mastery
A four-player Wii Kirby romp gathering ship parts for the stranded alien Magolor.
Harry Potter and the Prisoner of Azkaban leans Optimization (Practiced Mastery); Kirby's Return to Dream Land leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Prisoner of Azkaban
Simple spell-casting and platforming aimed at younger players
Kirby's Return to Dream Land
Easygoing main game; EX mode adds modest demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Prisoner of Azkaban
All enemies and puzzles are fully scripted
Kirby's Return to Dream Land
Bosses are pattern-scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Prisoner of Azkaban
Hidden collectible locations are fixed once discovered
Kirby's Return to Dream Land
Energy sphere hiding spots are static secrets
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Prisoner of Azkaban
Matching the right character's spell to each puzzle
Kirby's Return to Dream Land
Super ability timing and sphere collection are solvable
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.
full breakdown
Harry Potter and the Prisoner of Azkaban →
full breakdown
Kirby's Return to Dream Land →