I like them all. For Lucifuge, I prefer the more monstrous vibe and big paws/claws of 2, but I also like how shiny/squishy 1 looks, and I like 1's tentacle dicks uwu
For Sitri, I could honestly go either way, they're both good but have different vibes. I like the cute and fem vibe of 2, but the tall, lanky masc vibe of 1 is nice. It seems like a departure from the usual aesthetic of these designs, which can be a plus or negative depending on if you'd rather diversify the cast more or have him blend in more.