Some nice (and bad) things about reliable Argentavis

(A): has a MAJOR array of weight reductions (wood, metal, metal ingots, etc)

(B): has some 'desired' speed, making it very tedious to travel across large amounts of land, especially when you have large amounts of weight.

(C): I has a good stat distribution/desired stats, especially Weight

(D): can defend itself, but not well. (At least it can attack on the ground)

(E): it's pretty easy to tame for such usefulness

(F): amazingly high stamina efficiency, even at high weight

(G): commonly found in somewhat "safe" areas (the artic, mountains, redwoods)

(H): Sadly, it's saddle is at I think level 51 which is a pain (especially playing on base settings)