head to head
Neither is simply harder - they are hard in different places. Chaos Reborn demands more variance; StarCraft II: Wings of Liberty demands more execution.

Reads · Grand Arena
A turn-based wizard duel mixing bluff, spell-cast odds, and tactical board control.

Execution · Grand Arena
Real-time strategy where hands, reads, and build optimization all matter at the top.
Chaos Reborn leans Reads (Grand Arena); StarCraft II: Wings of Liberty leans Execution (Grand Arena).
StarCraft II: Wings of Liberty leans clearly harder on execution.
Chaos Reborn
Clicking units involves no twitch dimension
StarCraft II: Wings of Liberty
APM, macro, micro-control under pressure
StarCraft II: Wings of Liberty leans a little harder on reads, though the gap is small.
Chaos Reborn
Bluffing illusion spells against human wizards is central
StarCraft II: Wings of Liberty
1v1 ladder vs adaptive humans modeling you
Chaos Reborn leans clearly harder on variance.
Chaos Reborn
Spell-cast success and draws are dice-driven
StarCraft II: Wings of Liberty
map spawns minor; mostly known
StarCraft II: Wings of Liberty leans a little harder on optimization, though the gap is small.
Chaos Reborn
Board control and creature trading reward solid theory
StarCraft II: Wings of Liberty
build orders, economy curves heavily solved
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.