I still don't feel comfortable giving a simple answer to whether the prequels or sequels are better. I really think it depends on how you define "better".
As movies, absolutely I think you have to say the sequels are better. They're good, well-shot, well-directed, well-acted movies. On pretty much every technical level, aside from maybe the music, I feel comfortable calling them better than the prequels. I can understand why critics like them.
As part of the Star Wars saga, I go the other way. The prequels weren't great movies, but they always absolutely felt like Star Wars movies to me. I wish Lucas had had someone else polish the script and take over directing to get better performances out of the actors. But otherwise, they feel like they fit with the OT to me. Sure, there are a few inconsistencies here and there, but I'm generally able to accept a few inconsistencies, be they between trilogies, between movies, or even between scenes within a movie. The ST though... To me, it really feels like someone else coming in and playing in somebody else's sandbox without following the rules that were already established. And while breaking old rules can absolutely be a great way to break an old status quo and improve the product, a lot of these issues don't feel like the good type of rule breaking to me. As much as I can accept them as good movies, they really rub me the wrong way. TLJ more so than TFA, but even TFA had a few things that just felt off to me.
I used to be absolutely enamored with Star Wars. I read all the novels, played all the games, tried to get most of the comics, etc. I have no artistic talent, but used to waste hours upon hours drawing Star Wars stuff in Paint. In my high school programming class, we had an assignment to write a program in BASIC that would make an animation on screen. I wasted hours plotting out points to have the computer draw a TIE fighter line by line and have it swoop across the screen, only to have it be too complicated for the computer to do it in real time. Had to settle for just drawing the ship once and animating stars streaking by.
The point is, I used to be really, really passionate about the franchise. Now, I still haven't even bothered to watch Solo on Netflix. I still absolutely love a lot of it, but that passion is completely gone. It certainly didn't start with the ST. It was really the post-NJO EU that killed a lot of my interest. But for as much as TFA toyed with reigniting it, TLJ completely killed any enthusiasm I had left. I'm not sure if I'm an unintended casualty, an acceptable loss, or an intentionally jettisoned burden to open up the franchise to new audiences. I just know that I'm not buying into what Disney is selling. I still hold out hope that Episode IX might turn things around, but I'm not optimistic.