Lucifer (Dragon Ball) vs Phaneroplus: who would win?

Phaneroplus favored — Slight edge (~55%)

Lucifer (Dragon Ball) · Dragon Ball · Base

Tier
8-A, up to 4-C
Attack Potency
Multi-City Block Level+, up to Star Level
Speed
Superhuman, up to Transonic
Durability
Multi-City Block Level+

Phaneroplus · Kaiju No. 8 · Honju

Tier
LOW 7-C
Attack Potency
Small Town Level
Speed
Subsonic
Durability
Small Town Level

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