They are both mesh 1 piece designs, but other than that they are very different.
The M310 is AG's classic mesh style, which has a more bowl shaped concavity and more rounded spokes
Available in Hyper Silver, Matte Black, and Dolphin Grey in some fitments
The M590 is AG's newer mesh style, which has more angular spokes and scalloped spokes
Available in Satin Machined Silver only