The largest issue with comparing bg 3 and wotr is the systems. BG3 is a 5E game so the mechanics of the games are different at a core rule set vs Pathfinder which is 3.75 rule set.
The rules in 3.75 were not as balanced class wise. Saving throws worked much differently meaning certain mechanics at high dcs can be difficult for characters to handle vs 5e where those mechanics are not necessarily game breaking instant death is not necessarily going to be instant death in 5e vs 3.75 where its going to kill you. Barbarians / Paladins in 3.75 are drastically weaker in a lot of offensive perspectives than fighters. 5E shored this up significantly. 5E generally your not going to find a mage out damaging a melee character in single target damage but instead trading it off for aoe and utility. There are still some weak points to balance in 5E but its significantly less noticeable compared to 3.75 mechanics. Powers for leveling all the way to 20 in one class are also significantly better than 3.75 where multiclassing was much easier to work with as a lot of classes were very heavily front loaded so that you got a lot of the good abilities early out so deciding if you wanted to go all the way to 20 or not in a class was much less difficult of a choice. Part of what enabled a large amount more with customization to characters. There is a lot more focus on break points of power levels in 5E when choosing to multiclass stopping at the wrong level could drastically decrease your characters overall performance.
Mythic paths I think would have been much better as a I hit level 20 now there is this to explore aspect as it is traditionally in Pathfinder its something for after you already powered up like a beast. However illithid mind flyer powers are along the similar lines with BG3 so you cant really say that bg3 doesnt really add above normal power levels to characters.
Story line wise both games are decient for the story plot but its a matter of perspective I personally enjoyed watching other playthroughs more of pathfinder with some good narration than BG3 but that was dependent on content creators and the fact that WOTR choices felt more impactful on the way the story was going. Its one of BG3's current weak points while there are alot of choices present most of them are negative if you chose evil or as if the choice doesnt really have any direct impact and that your actual choice to kill or not kill an npc is really more impactful than any real dialogue choices in a lot of cases. It really feels more like a punishment than a real choice if you don't follow the path of a good guy in the game in general. The best arch of good vs evil choices being impactful with changing how the story actually unravelled was probably the SwTOR mmo game where everytime you played through the game it felt like you were playing a completely different story based on your choices. While it didnt drastically impact the game the story felt like you were going down a different path. BG 3 it doesnt really feel like your story changes that much with alot of the current existing choices outside if you kill certain people certain options are just not present.
It also again feels like picking any evil path is punished. If anyone can give me a positive benefit to choosing an evil path that benefits you more than choosing a good path I would be in shock and awe. PS different cinimatics dont count. You lose out on party members. You lose out on items and you dont get anything to replace the losses at all. If you chose the goblins even you get access to less shops and item crafting in general. Where as even if your the good guy in most cases you can pick pocket anything you would have lost out on for being good. Its just really not impactful. There are no particular rewards for doing an evil path or quest options really that truely expand evil play throughs.
WOTR you give up the good guy path you can take the path and get different bonus powers / benefits. You can benefit from evil items that give you particularly good bonuses in place of good items you cant benefit from.
