Likely a bit of each. You'll want skill the most for base power of your cures. MND to a lesser extent, and enmity- will keep you from pulling hate when a real tank isn't there and DD for some reason don't have good hybrid sets.
Noticed I went overboard with power, by assuming I'd need path A for Kaykaus. Going to edit set & post.
Sorry for the Necro again. Maybe I'm missing something, but from what I can tell the set doesn't quite cap cure power. For me as an elvaan it looks like it reaches 678 cure power.
Elvaan SCH/RDM @99
Mnd: 91
Vit: 83
Merits: +15mnd/vit
Gear Mnd: 152
Gear Vit: 96
Skill: 501
Thus power would be:
floor((91+15+152)/2)+floor((83+15+96)/4)+501= 678 cure power
We would need 22 skill or 44 mnd or 88 vit to cap it.
Something like this:
ItemSet 365430
Pros: doesn't require mission rewards like Janniston or Magnetic
Negatives: missing out on +13 conserve MP, 5% cure potency II, and 2% quickmagic.
Ultimately the cure potency on Janniston alone would make up for missing out on 22 cure power. The set I posted might be a good option if you picked a different ring/earring though.