Ultima vs Bel: who would win?

Bel favored — Slight edge (~55%)

Ultima · Final Fantasy · Incomplete Manifestation

Tier

LOW 2-C, up to 2-A

Attack Potency

Universe Level+, up to Multiverse Level+

Speed

Massively Ftl+

Durability

Universe Level+, up to Multiverse Level+

Bel · Dungeons & Dragons · True Form

Tier

LOW 2-C

Attack Potency

Universe Level+

Speed

Infinite

Durability

Universe Level+

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