I've played both Poe's and both original sin's and personally I didn't like any of them overall.
Poe 1 had an amazing first section right up to the first town. Then it felt flat and I spent the rest of the game bored. By the time I got to the famous "good part" I couldn't be bothered. The characters were meh for me as well. I did like the Grieving Mother exclusive stuff while playing as the psychic class though.
Poe 2 had problems with combat that I didn't notice in the first. It felt like 4e homebrew. It had potential but never went anywhere. I hated all the companions and most of the ncps. I did like the islander feel though, but as an islander myself it just did not click well enough. Funny enough I really liked some of the sidekicks. The pirate girl was amazing and the cipher girl was entertaining and kind of adorable. I also liked the mage from the shop. This game convinced me to never buy a game where companions can romance each other ever again. Its not banter, its annoying. It almost convinced me to drop romances all together. Almost.
Dos 1 was fun actually at first. I liked being a cop in a fantasy setting. It was novel ish at the time. Then the plot went sideways and teleported away. I didn't find the main plot that interesting from then on. Not bad but not interesting either.
Dos 2 was nice for the first two acts but I absolutely loathe the last two. I did like Loshe and Beast. Liked Ifan at first till his allegiance came into question. I didn't like the rest. The combat was not great either. Everything devolves into "the map is on fire". At least melee actually got abilities instead of copy paste auto attacks with different names.
So yeah out of these two devs teams I'd choose Larian. Only reason I'm here is because dnd lore is amazing.
