There's no one-size-fit-all option here. Some classes are stronger in different ways, but which one is best depends on you and your plans. As far as boosting, you're probably looking at a healer or tank due to queue times and survivability, and out of those two, probably a tank.Whats the best class for boosting and open world? I want to make a f2p veteran boosting twink. I will also use for questing with alts in open world.
What 20 class you think is best for pve ?Would not recommend using an 11, as you’d have to lock exp and run into the xp disabled experience gain debuff
F2P/ unsubbed veteran status accounts would not face this issue
With enough gearing and with the appropriate classes/ specs 20s can shred through dungeons just as fast as 11s, it just might involve a bit more involvement as opposed to whirlwind spam.
Prot pally does seem to be the current best 20 for dungeons AFAICT.If I could assume that the intention was to boost others then it might mean that you are not planning to skip trash mobs via stealth or combat drops or otherwise speed demon your way through an instance
Based on that I’d probably go with:
Prot paladin or guardian druid
Nothing fancy or groundbreaking. Just the most versatile classes for ensuring others make it though the run and don’t struggle with taking out packs of trash.