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Joseph seems bro-tier, so he'd be my first pick just for that.
Peter sounds like he'd be an excellent asset to the team, but the fact that he dies after a year is obviously a big negative. His ambition to rebuild humanity sounds like he could definitely start us out on the right path though, so hopefully in that year he can lend his knowledge to the rest of us and we can make the most of his time.
Kirsten seems pretty risky, and like she may hinder more than help sometimes, but also sounds amiable and could keep morale up.
On the other hand, Csilla already has valuable skills, and you wouldn't have any ass burgers to deal with from her.
Either way, I'd take the leopard gecko.