The first one.
The Stamina stat makes a big difference to a glass cannon...both in CP and actual HP gain.
His attack is already massive, so you need to make him as tanky as possible...your first does all that.
I would say Good Luck with the moveset, but no matter the moveset for him, he has a place somewhere...maybe not ShadowBall so much, but we have TMsfor that
My Alakazam army became useful again with this change.