Black Beetle vs Dreyfus: who would win?

Dreyfus favored — Slight edge (~55%)

Black Beetle · DC · Base

Tier

HIGH 7-A

Attack Potency

Large Mountain Level

Speed

Supersonic+, up to Relativistic+

Durability

Large Mountain Level

Dreyfus · Nanatsu no Taizai · Base

Tier

HIGH 7-A, up to 4-B

Attack Potency

Large Mountain Level, up to Solar System Level

Speed

Sub-Relativistic

Durability

Large Mountain Level

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