Heros ring is BiS but the other ring is up in the air.

If you need Vit then go with 8 vit melded Astral ring(preferably penta melded). If your good on VIT but need some PIE and some added healing that go with Allagan. Don't need either and just want better heals over time go with Vortex. All 3 are solid choices and offer something the other doesn't. Can't really go wrong with any of them.