The argy is a good grinding birds if you grid a lot then these are great. The griffin are better but for grinding no. Also im pretty sure the argys are faster. If you wanna steal wyvern eggs. Then use a griffin.
Basically it can pick up anklyo’s which not only are the best metal harvesters but also have reduced metal weight. What I’m trying to say is that it is good mid game metal farmer, for instance I just did a run with a level 45 argentavis and an Anklyo and got 1000 metal ore. On mobile btw so take some of these facts with a grain of salt.
Getting a massive TLC update in March 2018. The saddle will act as a mobile smithy, Argentavis will be able to carry with Talons as well as with its beak, reduced carry weight on obsidian and a few other unannounced resources (similar to the mammoth and wood), and will also gain a Rapid HP Regen upon eating (likely from devouring corpses and not specifically food from inventory). Like so people can see!