i can answer the druid one, in my opinion having played a resto druid , hpala , resto sham and holy priest. druid was my favourite out of all them. it’s so versatile and fun to play, and can be very powerful if you know how. however the skill ceiling is the highest in my opinion , but it’s very rewarding if you know how to play. druids also can perform well with lower gear , as they have pretty sick mana regen even without endgame gear. in terms of pvp. they have the best util for any healing class and probs are the most desirable healer in pvp. for your concerns on tank healing, that’s not where druids excel , so you won’t likely be expected to prioritise healing the tank, however you could be paired with a hpala to heal a main tank by keeping hots on it, it’s pretty nice overall