mesmer or necro
You might like to read this: https://forum-en.gw2archive.eu/forum/game/gw2/For-people-who-have-leveld-Necro-AND-Mesmer/first#post1864910
If you want just to chill in PvE without much challange i would recommend Necro, if otherwise Mesmer.
Necro is much “tankier” class and it is realy easy to play with in pve (dungeon included)