I would reccomend buying a raised wine with 375 base melee, I had one it came out with like 615 melee and I could solo red drops on extinction, and could kill titans easy(get sac saddle)
Honestly if your taming a giga for hunting, your better off with a rex, since the gigas stamina is horrible, oh and it's dmg % is below 100%. No idea who even makes these decisions