Okay guys, so, in a previous tip I said "DoN't TaMe GiGaS, tHeY wIlL lOse A lOt Of StAmInA, hEaLtH aNd MeLeE dAmAgE" and I was exaggerated. I was so wrong. I didn't actually see the true potential of Tamed Gigas. They are insane. Tame them. They are so good at pvp and if you are on SP they gather LOTS (I mean LOTS) of Meat and Hide. It is worth to tame it.
When I was trying find a oviraptor on my quetz, I saw a level 80 giga, and thought I could bite it and run away to see how fast it could run and what animations it had, then I realized that I could attack it from above without it attacking back. I just had to watch out for my stamina and find a safe spot to rest. I managed to kill it though. Was almost risk free of death.