The more I play PP, the more glaring is the fact that this is not a finished game, and that people making it don't really care much about it. Compare and contrast to Xenonauts 2, which is not released yet and looks better already.
- both games have plenty of art that looks placeholder - except X2 is not released yet, and those placeholders are clearly labeled as such
- both games don't allow you to rebind controls
- PP gives better indication of whether you're in cover or not, ala nuxcom. In X2 you have to judge this by yourself. imo PP is better in this regard, it's nice QOL.
- Both games have nice, rotatable 3d maps and soldiers
- you can't zoom in X2, which is a shame, as the art looks nice (but that prob saves the devs for having to do too much details). You can zoom in PP but why would you, everything is so fucking hideous.
- PP is nuxcom style AP, X2 is good old ufo:eu style
- PP displays nicely on the ground how far you can move and still fire, this is a very nice QOL feature that X2 lacks
- PP also indicates at which enemies you will be able to shoot at from your destination. Another QOL that should be implemented in x2
- you can deploy way more soldiers in x2, so the whole thing feels more like ufo:eu meat grinder
- you can move multiple soldiers at a time in x2, while in PP you have to wait for the movement animation to finish before you do anything with another soldier
- maps in x2 feel much bigger than in pp
- no direct-fire (VATS-style) in X2
- in X2 you have your familiar research tree progression, while in PP it seems you're stuck at same level forever, and only get lots new research when you ally with a faction
- PP aliens are quite original, x2 not so much
So, tl;dr X2 lacks some really nice QOL features, but feels more polished and labour-of-love than PP. PP is more to the riff of nuxcom, while X2 is firmly ufo:eu thing. PP is hidious, X2 looks very nice and stylised. Here's a brief let's play of 1st mission in X2, so you can see some art: