
Intro:
Hello!
This time, I'm gonna make an analysis between HP% and Healing Bonus% for Barbara and Diona.
The simulation I'll be doing will follow the following assumptions:
1. Base HP for both Barbara and Diona is 9000.
2. Both will be using +20 flower, increasing their HP by +4780.
3. They will be simulated with 5* HP% and 5* Healing Bonus% artifacts, with no addition from substat.
4. Talent lv6.
P.S the results below will have decimals removed from the table, to make it friendlier to read.
Result:
Barbara

*Note: "Skill healing" is the heal per tick of her elemental skill, and not her healing when using basic attack.
Now, let's compare:
HP% / HP% / HP% (1)
VS
HP% / HP% / Healing Bonus% (2)

As you can see, for both elemental skill and elemental burst, (2) is better, despite the lower total HP.
Diona
At first, I only wanted to post the analysis with Barbara. But then, it occurs to me:
Will triple HP% be better for Diona, considering she shields on her elemental skill?
So, I decided to include Diona in the simulation, and this is the result:

Again, let's compare:
HP% / HP% / HP% (1)
VS
HP% / HP% / Healing Bonus% (2)

We can see that (2) increase healing by 573 (20%), but decrease the shield by 741 (11%).
Considering Diona's field heals you 6 times, the lost healing is 573 x 6 = 3438.
Let's say you can use her shield 3 times before healing, the lost shield is 741 x 3 = 2224.
(It's not 2223 because of the hidden decimals).
Which brings us to:

Conclusion (tl;dr):
Healing-wise, Healing Bonus% is better than HP% artifact.
Personal Opinion:
I think Healing Bonus% is definitely better for Barbara.
I personally prefer Healing Bonus% on Diona too.
But, my BF prefers triple HP% for Diona, so I guess it's completely relative in the end.
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If you prefer Tanking/Shielding, then you should go with HP%.
If you prefer Healing, then you should go with Healing Bonus%.
I hope this analysis can help you decide on what to use for your healers!
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