Eight vs Build-a-Bot: who would win?

Eight favored — Slight edge (~55%)

Eight · Dragon Quest · End of Game/Postgame

Tier
LOW 2-C, up to 2-C
Attack Potency
Universe Level+, up to Low Multiverse Level
Speed
Immeasurable
Durability
Universe Level+, up to Low Multiverse Level

Build-a-Bot · Plants vs. Zombies · All Other Build-a-Bots

Tier
2-C
Attack Potency
Below Average Human Level
Speed
Immobile, up to Massively Hypersonic
Durability
Low Multiverse Level

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