This will be my first, and probably only guide i write, just because it is time consuming to create something people will read.

In here I will compare Healing Support, give numbers, and costs to do so. All numbers are Facts, Numbers are based off Max Skill level, all +% Boosts are based on a solid 100, This allows you to both see the power and show the +% (being +45% at 100 AP is, 45) and all opinions, are well, opinion.

The guide will be in a simple layout, Naming the Champion, the Healing Skill, and This information:


Healing Skill: Skill Name
Cost: Resource to Cast
Base Heal: Base health gained
Bonus: Bonus from +AP
Total: Total Healing Per Cast
CoolDown: How long in-between casts (in seconds)
HP/SEC: The health gained compared to the time to recast (Total/CD).
HP/MP: How much health is gained per MP spent
Extra: Anything else this spell does to alter gameplay (+armor, speed, etc..)

Healing:
heal·ing
ˈhēliNG
noun
1.
the process of making or becoming sound or healthy again.
"the gift of healing"

With that said, you will be giving your team the Gift of heals.

Listed are the Current Champions that heal SOMEONE ELSE, via alternate means. I WILL NOT include Champs that only self-heal. This basic guide does NOT cover the math based with CD reduction (Taric's -1 per hit, or Alistar's champ near death)

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Alistar

Healing Skill: Triumphant Roar
All Team healing is (halved)

COST:	80
BASE HEAL:	180(90)
BONUS:	20(10)
TOTAL:	200(100)
COOLDOWN:	12SECONDS
HP/SEC:	16.66(8.33)
HP/MP:	2.50(1.25)
EXTRA:	This skill is halved to any Allies caught in the area, it also has a CD reduction of 2seconds per nearby Enemy Champion death, meaning, the more you kill, the more you heal.

Conclusion:
Here we see that Triumphant Roar changes based off if it is a self heal or team heal. Alistar has high heal potential, but is nerfed due to the fact team heal is halved. Skill would be useful to run Alistar as a tank, using support to assist in the down-time.

Janna

Healing Skill: Monsoon
Skill is an Elite (lvl6)

COST:	200
BASE HEAL:	150(600)
BONUS:	35(140)
TOTAL:	395(740)
COOLDOWN:	120SECONDS
HP/SEC:	1.54(6.17)
HP/MP:	1.98(3.7)
EXTRA:	The main cast of this skill is Enemy Knockback, and its side effect is healing for all friendly Champions. It pulses 4 times.

Conclusion:
Janna is defined as a Ranged Support. While her skills assist team members in Speed and movement, only her "Elite" skill can heal.

Lulu

Healing Skill: Wild Growth
Skill is an Elite (lvl6)

COST:	150
BASE:	600
BONUS:	50
TOTAL:	650
COOLDOWN:	80
HP/SEC:	8.12
HP/MP:	4.33
EXTRA:	Epic skill that boosts players health by 650 for 7 seconds and slows nearby hostiles by 60%.

Conclusion:
Wild Growth is an Elite skill that adds 650 life for 7 seconds, so in a way, it is heal, but more so a health buff.

Nami

Healing Skill: Ebb and Flow
Skill is a bounce cast.

COST:	130
BASE HEAL:	185
BONUS:	30
TOTAL:	315(2-182.75; 3-155.74)
COOLDOWN:	9SECONDS
HP/SEC:	23.89
HP/MP:	1.65
EXTRA:	Skill is standard click to cast, healing target, and then bouncing 2 more times, taking a -15% reduction in end power.

Conclusion:
Ebb and Flow has decent potential, however, the bounce patterns are: Friendly:Hostile:Friendly, OR, Hostile:friendly:Hostile. The skill will not hit the same target twice, and will follow the bounce pattern.

Nidalee

Healing Skill: Primal Surge
Skill is standard click to cast.

COST:	140
BASE HEAL:	190
BONUS:	70
TOTAL:	260
COOLDOWN:	10SECONDS
HP/SEC:	26
HP/MP:	1.86
EXTRA:	Skill is standard click to cast, healing target, and giving them a bonus +60% Attack speed for 7 seconds

Conclusion:
Nadilee is a Assassin/Support, or so they say. The potential for her heals are very high, it has a good base, and good +ap %, however, being that shes an melee assassin, getting focused will be incredible easy. Be wary.

Sona

Healing Skill: Aria of Perseverance
Skill is standard click to cast.

COST:	80
BASE HEAL:	120
BONUS:	25
TOTAL:	145
COOLDOWN:	7SECONDS
HP/SEC:	20.71
HP/MP:	1.81
EXTRA:	Skill is temp aura/cast. Casting the spell causes the heal effect to self and 1 friendly, and adding 3 seconds to the temporary aura.

Conclusion:
Sona is a support. While she is also ranged, all of her skills support your team some how. Shes an easy to use Champion, and beneficial to all game plays.

Soraka

Healing Skill: Astral Blessing
Skill is standard click to cast.

COST:	200
BASE HEAL:	350
BONUS:	45
TOTAL:	395
COOLDOWN:	20SECONDS
HP/SEC:	19.75
HP/MP:	1.98
EXTRA:	This skill adds +Armor to the ally casted on at a rate of +105 for 3 seconds.

Healing Skill: Wish
Skill is an Elite (lvl6) Fire and forget.

COST:	250
BASE HEAL:	440
BONUS:	70
TOTAL:	510
COOLDOWN:	130SECONDS
HP/SEC:	3.92
HP/MP:	2.04
EXTRA:	Skill is an Elite skill, and requires no aim. Just press and ALL Friendly Champions will be healed.

Conclusion:
Soraka is a very useful Support Champion to play, she has an AOE, Healing, and MP recovery.

Taric

Healing Skill: Imbue
Skill is standard click to cast, adding +40% If self cast.

COST:	140
BASE HEAL:	220(308)
BONUS:	60(84)
TOTAL:	280(332)
COOLDOWN:	16SECONDS
HP/SEC:	17.50(20.75)
HP/MP:	2.00(2.37)
EXTRA:	Skill is a standard click and cast. Can be self cast or friendly. If it is self cast, a +40% Heal will be added. Each melee swing that hits reduces the cooldown by 1second (3seconds for Champion hits).

Conclusion:
Taric is a tank. His cooldown is modified by how often he hits. So the more in your face he is, the faster he can heal.

This concludes my brief guide on heals. It's mostly numbers, and a quick idea of what will happen. Guide will be updated as changes occur.

The is no such thing as "The Best" healer/support. While Soraka has the hardest hit healing spell, the cooldown might not chive with the game tempo, and might be better suited for Sona, with her fast and low heals.

Thank you for Reading, and please leave comments so I can adjust if I missed something.