Who to chose?

As the moonlight passed through the window, Cain fell on his bed exhausted. His entire body was screaming in pain as did his stomach.

There were several reasons for his pain, most of them only time can heal.

Starting with his stat increase, other than MP which was stored in the soul and he could handle the increase. HP and SP were a problem.

MP regeneration was the rate at which the body regenerates mana by absorbing it from the surrounding area. Having that massive jump almost Caused Cain's skin to start burning, but such a thing could be easily mitigated by his sheer skill and precise control.

As health was an indicator of how much damage the body take while still functioning. Its increase means that a fundamental change has happened across his whole body.

Small threads of magic fused into his muscles, bones, and organs reinforcing them from the inside. That would make it tougher to cut through his flesh, make him survive with more severe injuries, and function just as well.