[EDIT: Okay, those two sets would result in similar performances, didn't really doublecheck. Derp. Basically re-posting this as my general summary was incorrect due to forgetting zenith pumps +1's cure potency augment.]
I would picture that Tefnut set winning outside of Lightsday where the Arka IV setup will win due to the extra healing magic skill. This is what I just put on the Tefnut Wand page on FFXIAH:
In order for Tefnut + Genbu's to be better, you not only need 5 potency on Genbu's, but perfect augments on zenith pumps +1 (these are in fact mandatory, you would need perfect augments on these for the build to win in the long run). While that helps both builds, it's enough to give the Tefnut set a 1.5 skill advantage (from the MND difference being worth approximately 6.5 skill). Iaso Boots wouldn't be enough either, you flat out need the skill.Post-healing magic skill update:
See the following item sets for comparison (VIT+ is the same for both sets):
Item set # 255028 - Staff
Total bonuses: +50% Potency, +88~91 Healing Magic Skill, +30 MND
Item set # 256460 - Tefnut / Shield
Total bonuses: 50% potency, +83 skill, +43 MND
The staff build DOES have more skill, but considering 1 skill ~ 2 MND, the +13 MND on the Tefnut set accounts to an extra ~6.5 skill roughly so it would be SLIGHTLY better (+1.5~ skill advantage worth of potency) outside of Lightsday where the Staff build will win regardless.
Suppose it boils down to preference nowadays. Get lucky on Genbu's augments? Use Tefnut. Don't like club/shield? Use staff. There's situations one is better than the other, at least until more gear comes out. There isn't a given "X is always better than Y" here.
Factoring builds without Zenith Pumps +1 would factor using Rubeus Boots for skill instead, while switching out hands (Healer's Mitts +1 > Augur's Gloves) to reach 50% for a Tefnut set and honestly giving up 10 healing magic skill is too damaging in that situation (however in this situation both sets would be using Phalaina Locket anyway). That is how required zenith pumps +1 are for a Tefnut build. Quite a bit of effort for a marginal improvement, and I do mean marginal. And on Lightsday, all that effort would be for naught vs. a staff/grip build using the same gear except for Colossus's Torque over Phalaina.

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