Whatever you prefer really.
Personally, given that Giant Barb is mostly focused on throwing, there's the issue of competing for equipment when running 2 of them. As you only get 1 copy of the Ring of Flinging, Gloves of Uninhibited Kushigo, Returning Pike and Nyrulna.
Meanwhile, going some other type of Barb (Doesn't have to be Bear Heart. Tiger Heart is pretty decent for having that infinite use Cleave that guarantees Bleed with no save. With Wolf Heart being useful if you have other melee that can benefit from the passive Advantage bonus) for a more typical melee Barb would spread out the equipment usage (Armour/Clothing would still have some competition, but there's options available. Even more so if you go Dex Barb)
Of course, you can still go for less optimal play and just go melee Giant Barb too to avoid the gear situation. Then you can have the funny situation with Giant Rage + Enlarge (Elixir or spell) on 2 characters causing them to be HUGE.
