They are the best creature for ark. They are great if u upgrade them and they have a smithy on them. Upgrade it’s weight stamina health and melee damage. Mine killed a level 50 giga very fast. They are great for traveling but avoid water so u don’t fall into and have to go to shore and wistle follow. Allways bring them for tames and set there behaviour to attack only conscious. Then u may tame it from off its back and set it next to ur tamed animal then put him down so if anything attacks ur untamed u can attack it and ur Argentavis will kill it. Their stamina is amazing so u can travel across the map and they are pretty fast. They can carry a lot of weight so u can go on metal trips and carry it back on them. If u are on a online server these still apply but online these are also amazing creatures because u can live on it basally because all u need is one shelter and then u can set ur tame there after ur online.
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!