50 All Stat Vs. 30 M.Att

If I understand the damage formulae correctly it's all linear anyway so you could brute force it, see how much +1 static INT and +1 static Matk give with your equips on, then compare directly taking into account potential boosts in Matk%, Damage% or INT% from weapon pote as needed, since they're easy to add up. This'd be pretty trivial to find out with some of the worst Alchemy pots (INT potion I and Matk potion I).

Maybe there's a better, more analytical way though.