head to head
vs
Bloons TD 6vsGemCraft
Bloons TD 6 leans Optimization (Pure Optimization); GemCraft leans Optimization (Pure Optimization).
Bloons TD 6GemCraft
Axis by axis
Execution1 vs 2
GemCraft leans harder on execution: Placing gems and towers has no twitch demand
Reads0 vs 0
Even - both lean on reads about the same.
Variance1 vs 2
GemCraft leans harder on variance: Wave composition is fixed once a level is known
Optimization9 vs 9
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.