King_V :
How so? I really know little about the difference between MSIs models, but remember being curious about it at one point.
Manufacturer have multiple models for each GPU. Different cooling system, looks/aesthetics, performance, warranty, noise, etc. Example:
Gigabyte: Windforce < G1 Gaming < AORUS < Xtreme
Armor is the most basic/budget model of MSI. Spending a little more for something better is recommended but
overall it should perform well. You could also get the RX 480 if you find a good deal. (580 is 10% faster)
As for which brands are better, they are the same overall. I prefer Gigabyte because I never had problems with it while my friend like the way MSI is pronounced. So it comes down to your preference.