Which heal should you be using?
Well, this is a bit of a complex question. Until recently, I was using my 68 heal (Yoppa's Mending). I did the analysis below and determined that I thought the 73 heal (Ankhaul's Mending) was better for me.
That comparison was based on only having the Discordant Healing focus, and not having the Ancient Wilsik's Mending spell. In order to make this comparison more accessible, I've broadened a bit to include a higher focus (Blessing Of Anguish, 45% useable up until level 70, with a 10% degredation rate) and the Ancient Wilsik's Mending spell.
The base amounts for the heals are:
Yoppa's Base = 2468
Ank 1 Base = 2788
Ank 2 Base = 2887
AWM Base = 2716
FOCUS:
Discordant Healing = 45 @ 68, 40.5 @ 69, 36 @ 70, 31.5 @ 71, 27 @ 72, 22.5 @ 73, 18 @ 74, 13.5 @ 75
Blessing Of Anguish = 45 @ 70, 40.5 @ 71, 36 @ 72, 31.5 @ 73, 27 @ 74, 22.5 @ 75
So, 22.5 would be the focus at level 73 for Discordant Healing. (multiplier = 1.225)
And, 31.5 would be the focus at level 73 for Blessing Of Anguish. (multiplier = 1.315)
With NO AA,
Yoppa's: Max = 3578, Average = 3023 (does not change whether using Discordant Healing or Blessing Of Anguish)
Ank 1: Max = 3415, Average = 3101 (BoA: Max = 3662, Average = 3227)
Ank 2: Max = 3536, Average = 3211 (BoA: Max = 3796, Average = 3342)
AWM: Max = 3693, Average = 3204 (BoA: Max = 3938, Average = 3327)
ASSUMPTION: Healing adept mastery modifies the BASE heal amount. The focus effect is then used as a multiplier against the base total. Source =
http://samanna.net/sham.info/healing.shtml
After factoring in healing adept mastery 3 ( 1.28 ):
Yoppa's Base = 2468 * 1.28 = 3159
Ank 1 Base = 2788 * 1.28 = 3568
Ank 2 Base = 2887 * 1.28 = 3695
AWM Base = 2716 * 1.28 = 3476
Yoppa's: Max = 4580, Average = 3869 (does not change whether using Discordant Healing or Blessing Of Anguish)
Ank 1: Max = 4370, Average = 3969 (BoA: Max = 4692, Average = 4129)
Ank 2: Max = 4526, Average = 4110 (BoA: Max = 4859, Average = 4276)
AWM: Max = 4727, Average = 4101 (BoA: Max = 5040, Average = 4259)
Conclusions:
If you have Discordant Healing, and do NOT have Ancient Wilsik's Mending, Ankhaul's Mending Rank 1 (or Rank 2) is better due to the higher average healing (despite having a lower maximum heal).
If you have Blessing Of Anguish, and have Ancient Wilsik's Mending, I would say that your current combination is better than Ankhaul's Mending Rank 1 (and Rank 2) because of the higher (or insignificantly lower, in the case of rank 2) average healing and higher maximum heal.
As Jaraman points out later in this thread, you should also consider your focus effects. In particular,
* beneficial spell range
* mana preservation
* spell haste