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.

Optimization · Pure Optimization
Managing a coin economy against escalating scripted raids with deliberately unexplained rules.

Optimization · Pure Optimization
An auto-battling deckbuilder about building a loop to defeat the Lich.
Kingdom: Classic leans Optimization (Pure Optimization); Loop Hero leans Optimization (Pure Optimization).
Kingdom: Classic leans a little harder on execution, though the gap is small.
Kingdom: Classic
Riding left and right and dropping coins demands no twitch skill
Loop Hero
Autobattler, almost no inputs.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdom: Classic
Greed waves follow scripted escalation, never adapt to you
Loop Hero
Enemies follow scripts.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdom: Classic
Unexplained mechanics and map layout are hidden until mapped
Loop Hero
Card draws and loot drops randomize.
Loop Hero leans a little harder on optimization, though the gap is small.
Kingdom: Classic
Coin economy and wall timing are the solvable core
Loop Hero
Deck and tile placement reward deep optimization.
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.