Comparing UE 4 and UE 5 is easy matter for me, I miss having the ability to change form without having to spend 2 minutes fast traveling to and from the position, the models look slightly better, and the story is nice.
What isn't nice is being teleported sixty feet under whenever I get on a horse. Extra points for no-autosave-forced-to-climb-on-centaur-and-cannot-dismount bug which sent me 2 hours back, when I still remembered to manually save.
The quests are fucking borked to the max though. The first anubite who is part of the quest can randomly de-spawn or re-spawn into hostile entity if you get far enough, even before reaching the dreaded doors, which was point of despawning for me 2 times. Luckily for the devteam, it makes sense in-universe. What doesn't make sense to me though, is enemy respawns, it happened to me 3 times that to finish the fight, I had to leave the area, as the dead immediately respawned in the position where I just killed them.
Other than that, the game in UE5 feels slightly better graphically, on the other hand UE 4 never managed to fuck up getting on horses, mostly because there were none.