Well, with Eve you can be infiltrated and months / years worth of work stolen and destroyed. You are, however, left with a personal inventory of assets spread throughout the planets and systems and a bank account full of isk. Reputation built up with AI factions, etc.
In Ark, you can be completely raided and wiped being forced to start 100% over naked as the day you were born with absolutely nothing but your character's build. Months / years worth of work gone in minutes. The fact that you can lose more time / effort, have to risk more with every fight, and are often just raided by trolls, makes me say it's more brutal.
Tribe infiltration, insider sabotage, and mind games are all the required strategies if you're going to play PvP. It seems like it would attract people from this community more than it seems to have.
The game does need a bit more polish but it is completely playable. Very few real bugs in comparison to other early access games, especially if you just want the PvP experience.