There's better survivability potential as a Caster Healer from what I've tested prior to the patch (with the free Fountains), and it seems to still be the case in this patch (should be the case in any patch anyway). As a Melee Healer you need to nuke fast or you run out of Mana faster than any other Mana user classes and builds I know of (only Mana class I haven't played much is the Warden, so I'm not sure about those).
In this patch if you use a one-handed weapon plus a shield you have less Faith, which means less Mana, but obviously you have more armor. If you use a two-handed you have more Faith, thus more Mana, but less armor. With more Mana you can stay on the offensive longer (can be negligible depending on talents rotation and total Mana costs after 'x' amount of time), but you're obviously more vulnerable, hence the necessity to use controlling skills whenever you should (but costs Mana as well and doesn't do dps, you just control), otherwise you're toast. I myself would only use a one-handed plus shield combo as a Caster Healer. Or of course Full Healer, especially for PvP, although for PvE being a Full Healer or Caster Healer with a two-handed and having more Faith means you can heal more since you have more Mana, but I'd keep that possibility only for PvE content, certainly not for PvP.
I don't know many "pure" Caster Healers around, and the two "CH" builds I did myself try prior to the patch were most likely not "pure" CH builds. I'm not sure if there's such a thing as an actual "pure CH build" to be honest (correct me if I'm wrong). I've been a Melee Healer since... almost forever (I was a "Melee / Healer hybrid" a long time ago when the Level cap was still 42). My play style wouldn't fit if I switched to something else right away, I'd obviously need time to adapt and actually "play like" an actual Caster or Full Healer (playing "like a" Melee Healer requires another approach to fighting). Not that I have the gear to make much out of my current MH build anyway. Taking a two months break in Allods is virtually impossible to catch up to, one or two weeks maybe (and even then), but not two months. Now I can only deal enough dps against new comers to end-game with similar gear (Cradle Reputation, or A2 mythics/legends).
What I do like to do however, for now, and until I get better gear, is to control my opponents as much as I can and ironically keeping as much distance as I can, by using Particle of Light and Chain of Light, and only going melee to pop Fanaticism and/or to use Holy Rage to entangle single targets in chains to slow them down (with Rank 3 Veracity). It seems to be efficient for that purpose (controlling), better than nothing. I do notice sometimes some League players trying to control me as soon as they can, I think some of them realized that despite the fact that I can't deal much dps I can still disrupt their fights well enough for some time if I do manage to control them first. So if anything at least a Melee Healer can also control (not as efficient in PvE unfortunately, since many mobs are immune to most if not literally all our control talents including Intimidate from a Warrior shared talent).
But, again, I think that a Caster Healer can and should survive much longer than a Melee Healer in almost any given fights. In my opinion, the general idea when comparing both Healer styles and builds would be along the lines of:
Caster Healer if:
1) Prefer defensive game-play
2) Prefer PvP over PvE (doesn't mean they always do better in PvP)
Melee Healer if:
1) Prefer offensive game-play
2) Prefer PvE over PvP (doesn't mean they only do better in PvE)
In the end, it's a question of personal preferences and situational efficiency.






















