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

Variance · Pure Chaos
Pachinko-puzzle hybrid where one lucky bounce triggers Ode to Joy.

Variance · Pure Chaos
Laid-back co-op roguelike about funky aliens opening mystery presents on randomized Earth levels.
Peggle leans Variance (Pure Chaos); ToeJam & Earl leans Variance (Pure Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Peggle
Aiming the launcher is gentle
ToeJam & Earl
Slow exploration with light dodging of Earthlings
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Peggle
No opposition whatsoever
ToeJam & Earl
Earthlings wander on scripts, never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Peggle
Bounce physics chaos decides most shots
ToeJam & Earl
Unidentified presents and random levels dominate runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Peggle
Angle planning and power choice for setups
ToeJam & Earl
Present knowledge and level routing reward experience
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.