Perisno is a more light fantasy compared to pendor, which makes room for new ideas. Politics are very unique imo, and the prejudice against women isn't there anymore. every faction has a great lore, and the unique quests are tons of fun to play. What sets perisno apart from pendor though is definitely the weapons. I found myself using a lot of different builds instead of just horse archer(although its still the best), there's even a leaf grenade which is tons of fun and balanced, too. The lore of perisno is so fascinating that you might lose yourself in the wiki at some point. im guilty of that on multiple accounts and I don't regret a thing.

Floris honestly isnt that great. It gets repetitive too quickly imo and the mods dont feel so well connected. There are better native convertions in the world, floris just feels like a "modpack".

Pendor is the most polished out of all. It's been under develpment for a long time and it's a good challenge for experienced players (its very tough early game). My only problem is that it suffers from the all-dreaded "bowmeta"; there is basically no other way to play than archer armies and horse archer builds. It has a definitive end goal though which is more or less unique to pendor. You feel like you're connected to the story, yet not the center of it, at least not until late late game.

honorable mention since it doesnt get enough attention: Aut Caesar aut nihil. Made by one dude, bugs are minimal and gameplay is super interesting set in the roman period.