When I was leveling my SMN/SCH (I like them both and can't make up my mind) I gave most of my attribute points to INT, occasionally I spent some of them on MIND and maybe Piety (not really sure though). Is it safe to buy a potion to give to my SMN's INT 30 point? I'm asking because I read different opinions and I'm a bit confused. I don't want to do something which might prevent me to use successfully my SCH in end game content.

I also leveled a WHM, but I doesn't enjoy it as much as I enjoy being a SMN or a SCH.

Anyway, I would never create an alt just to play both classes: it would mean starting from 0 once again and without your friends / FC company friends since you would have also to change server (if you have paid an entry-level subscription).