Annihilation is more thoughtful and distinct. But I think both are good movies.

SPOILERS

I think this is me being nitpicky but I just thought it was weird their method was to send in team after team never to be heard of again. What about a robot? What about tie a rope to me, send me 10 feet in, then yank me out? This sounds like a stupid complaint as I type it, but for whatever reason, it distracted me for a bit. Once inside, none of their decision making stuck out as idiotic, because they all had issues that made it easy to understand why they might not take the most logical actions.