Mark Space vs Malcador the Sigillite: who would win?

Malcador the Sigillite favored — Slight edge (~55%)

Mark Space · Toaru Majutsu no Index · Base

Tier

8-B, up to 8-A

Attack Potency

City Block Level, up to Multi-City Block Level

Speed

Superhuman

Durability

Street Level, up to City Block Level

Malcador the Sigillite · Warhammer 40,000 · Base

Tier

8-B, up to HIGH 4-C

Attack Potency

City Block Level, up to Large Star Level

Speed

Hypersonic

Durability

Building Level, up to Large Building Level

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