Speaking from resto druid pov,
I would roll druid for a few reasons. One, you can always spec boomkin and be one of the strongest caster dps in the game with 0 gear change. It's fun to mix it up, where as shaman you probably need to off play as enhance which is a new set of gear. SP is the same gear and super strong also.
Two, feral affinity/master Shapeshifter is insanely broken. More so at 69 than any other bracket. (first bracket with f.affin and master shapeshifter) My 99 rdruid his as hard as my 69, idk why. I'd argue it's one of thw highest dmg dot classes in the bracket and a top 3 1v1 class. I might be biased though. You can top charts even vs other twinks if you focus only into dmg which is insane for a healer.
Third, spec double swiftmend + 3rd wind potions and guardian affinity makes for an extremely tough kill and very nice burst heals to go along with the best hots at 69. If your focus is healing and you're good at kiting you can absolutely be a havoc and force the other side to focus you first, then you just kite them. If you can find Shar's armory that is a prime example of what I'm describing. NE with meld has so much outplay potential and horde cow stomp is a big get away ability, though ne is better imo. That's my case
