Even though all good leftists know this is a false choice. The only correct path is that of Volcel Geralt who gets to chill with Ciri on his vineyard, hunt monsters and sleep under a tree. This is the pinnacle of the Dudes Rock lifestyle.
Fuckboi Geralt is a distant second since he's like 200 years old and should simply not be fucking anyone.
You know, the first time I played games I hadn't read the books, so I barely knew who Yennefer was and was somewhat confused when she was such a major character in the third game. Googled her, saw in the books she was his partner, but that their relationship was weird, and also there was genie magic involved. So I picked Triss, and I like Triss.
But, and I'm not especially qualified to talk about this so take my word for what it's worth, Triss does seem to be playing to a reactionary fantasy. Now I've never read a word on literary criticism, or feminist theory, or critical theory. I wish I had. I wish I had gotten some sort of English degree because they probably would've made me read those sorts of texts. But I haven't, so I'm just a guy poorly regurgitating opinions I once saw someone else have. But, Triss is so submissive to Geralt, to the player. She's just happy to do things his way, pretty much all the time. Yen, on the other hand, won't put up with his, or the player's, shit. Now Yen and Geralt's relationship isn't a good one, just the opposite, and Yen challenges him and manipulates him past the point of reason, but at least her character has some agency.
Of course the best ending is no romance, completely agree. I like it because 1.) it's pretty tragic, breaking up with Yen. I like tragic. and 2.) the romance endings are all straightforward happy endings. Geralt isn't a happy endings sort of guy.
TLDR: Triss is a trad wife male power fantasy.