TCB
Usually considered the most accurate for translations, at least for popular series such as Jujutsu Kaisen and so on. It also has no pop-ups, and adds fanart to most chapters at the end of them to add a nice touch.
MangaFire
Not only does it have a smooth system with not that much lag, but the translations are able to even be switched to the raw kanji if needed. Also, yes, there are a lack of pop-ups or not that much.
MangaHere
Smooth system with no pop-ups.
MangaKatana
Again, a smooth system with no pop-ups. It also notifies you when a new chapter is out.