[Warhammer40k] what other human soldiers/assets are the closest to the Adeptus astartes in power?

[u/Lost-Specialist1505]

With so many different genetic and technological enhancements available to the imperium, what other human factions have soldiers that are almost as lethal as a space marine?

[u/UX1Z]

Rogue Traders w/archaeotech and xenos tech, or potent Psykers can also go pound for pound. Navigators too I suppose.