head to head
vs
Chaos RebornvsHearthstone
Chaos Reborn leans Reads (Grand Arena); Hearthstone leans Variance (Grand Arena).
Chaos RebornHearthstone
Axis by axis
Execution2 vs 1
Chaos Reborn leans harder on execution: Clicking units involves no twitch dimension
Reads7 vs 6
Chaos Reborn leans harder on reads: Bluffing illusion spells against human wizards is central
Variance6 vs 7
Hearthstone leans harder on variance: Draw RNG and discover effects swing games
Optimization7 vs 7
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.