Best temperate O2 planet for outpost

[Brakiri]

Hi all,

before I stop playing I just wanted to build a nice outpost and connect the other outposts for resources.
Can you tell me what the best temperate 02 planet (plus biome) is for a base with nice flat building space and maybe some dangerous critters that my turrets can take care off? Would like some Starship Trooper- vibe :)

Thanks!