The charts Caulderone linked cover the endurance aspect of the two procs. The health aspect, however, is a little fuzzier. The Numina unique is a 20% boost to Regeneration, which will work out to various amounts of HP recovered based on how high your character's max HP is. The Panacea proc, however, is unaffected by your AT or max HP, and heals you on average for ~195 HP per minute (if you put it in an auto power) at level 50. It's also affect by Healing Received and Healing Delivered buffs and debuffs. The good news is that this is more HP per minute than the Numina Unique will give you even on a Tanker with capped HP, so there's a clear winner in the debate, and no need to stress about which would be better for your character.