Kroot vs Cloud Giant: who would win?

Cloud Giant favored — Slight edge (~55%)

Kroot · Warhammer 40,000 · Krootox

Tier

HIGH 8-C

Attack Potency

Large Building Level

Speed

Hypersonic

Durability

Building Level+

Cloud Giant · Dungeons & Dragons · Smiling One

Tier

HIGH 8-C, up to 8-A

Attack Potency

Large Building Level, up to Multi-City Block Level

Speed

Relativistic+, up to Ftl+

Durability

Large Building Level, up to Multi-City Block Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.