Definatly either a cleric or a shaman. Druids are better at soloing, and once you hit the higher levels youll find that your monk slows your druid down more than he helps him.
IMO if you are starting 2 charecters from level one and are going to 2 box. Go with monk/shaman. Having pocket haste and regen from the getgo will make your earlier levels a ton easier
But If you already have a high level monk and you are twinking/pling a bot...go with cleric.
From a Strict Healing Standpoint....
IN the end of the end the Shaman will most likley end up being the better partner to the monk than the cleric. Using a combination of Slow and Torpor and high aggro spells to keep the Mob on the Shaman the Monk/Shaman duo can pretty easily do tier 2 where as the cleric and monk will have a harder time.
BUT before you click that shaman button remember this...it takes a lot more work and a lot more time to get a shaman to the level where they are useful than it does to get a cleric to the level that they are useful. A cleric is useful and helpful starting from level 39. A shaman doesnt really become good until well into the 50s. A level 50 cleric and a level 60 monk can do tier one mobs. Youd need a level 58 shaman.
Additionally to truly get a shaman to max potential you need level 60 and the spell torpor...a spell that is going to run you 40k or a 10+ hour camp in the bowels of OS behind locked doors where you will need a rogue with you at all times. Rememeber that also.
From a Utility Standpoint
Both the cleric and the shaman have impressive utility abilities asside from there damage mitigation abilities...IMO though the clerics utility increases with levels while the shaman's decreases. How do they size up?
Shamans get haste but at high levels that becomes less important if you have your epic. Shamans can buff your stats and hp...clerics can massivly buff your hp/ac I personally find that HP > all so I like cleric buffs better. Additionally Ageo/Virtue has better tradability with other casters than other buffs.
While clerics cant slow they can reduce damage output of mobs with stuns, and are far more effciant healers than shamans.
Clerics are better at crowd control and pulling than shaman. With stuns, roots, mem blurs and pacify a cleric can totally remove an unwanted add from the fight rather than just holding him off for a while by training it away and bluring it. Clerics also make it a lot easier to get around than shamans. While shamans have invis clerics can pacify and invis vs undead a much more potent moving combo than just invis.
One area where shamans kick the clerics ass is in mana regeneration...there is no getting around that...clerics will definatly have more downtime than the shaman
Shamans can do more damamge than clerics with there dots but cleric nukes are still respectable in a pinch. Clerics also have AoE which is nice if you farming. Clerics also have fear and snare (if dark elf) so you can fear kite without haveing to rely on ID
and Clerics can of course res...which in addition to saving you time, exo, and money has a variety of utility uses...especially as a poor mans bind. It can also be used as a quick way to raise some extra cash if you need some PP. As can casting virtue/boa in nexus.
Finally, from the perspective of raid utility...a raid only needs a couple of shaman to be effective...any more than 3 and the rest are usually going to be standing around...but there is no limit to the number of clerics that a raid needs, you really cant have to many. So if you are raiding consider the value your bot brings to the table there
I spent a lot of time considering each classes strengths and weaknessess and finally decided to go with a cleric over a shaman. But in the end its your choice what you want
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