Best tank for m+ and on

So I runna prot pally and tbh I love it although there is not much to do as far as complexity and various ways to do damage. I recently noticed that they’re not statistically shown to be the best tank in m+ dungeons and I also read that dks are top of the spectrum. Is this true and is it worth it then to level up a dk? I wanna be able to wreck shet.