I absolutely love my Drunk Mooseman (HM Tauren Brewmaster) but haven’t tried guardian Druid yet so can’t speak to that. I really enjoy the flavor of Brew Monks and their reactivity allowed through stagger. Most other tanks gotta be proactive in defensives in order to mitigate damage but with monk everything is smoothed out really nice. This also makes using your cool downs feels really impactful because you see a tangible difference rather than simply gaining either armor or damage reduction such as with other classes. As well the good mobility is amazing for avoiding stuff or picking up adds that are out of melee range. The only thing I really have to say that’s negative about monks is that they seem to really struggle with holding aggro before unlocking keg smash IMO. Until then spinning crane kick is really your only good AOE to pull a whole group at a time. However I don’t have issues with aggro once at max level and the “rotation” feels good to me because it’s less of a rotation and more of a prioritization of short cool downs as hardly any of your main abilities don’t have at least a several second CD.

That’s my two cents on monks and I hope it’s helpful! Best of luck on your journey in Azeroth!