Sprites were way better :( they didn't have to be, there are plenty of games that do models right but in Pokemon they're a) kind of bland and colourless b) not animated with anywhere near the personality the BW sprites were. instead of having some cute idle loop expressive of their personality they basically just sway back and forth.
Sooome of them are better at this, I remember thinking the models in LGPE looked beautiful bc they were more colourful, higher res and matched the environments, but the animations were still bland as hell. I think with sprites, especially static sprites my brain is willing to accept some lack of quality because I know it's a compressed look, but when you have a fully 3D animated battle scene it realllyyyy calls attention to the remaining glaring problems for me, like "wait, why is every pokemon just swaying back and forth," "wait, half the move animations still look like trash". etc etc.
In general I like where they've been going with the Gen 8 (counting LGPE) battles and they definitely look WAY better than the 3DS era, but honestly they should have just stuck with sprites.