How do you define "Best"?
I mean, here's a character concept from my pile of "Would love to play":
Probably something like STR 15, DEX 12, CON 14, INT 13, WIS 10, CHA 8
Level 1: Barbarian.
Levels 2-4 or 2-6: Wizard (School of War Magic)
Levels [5,7]+: Barbarian. For subclass, several work...