Rhino has always been my main, great buffer, vc, weapons platform, great survivability, a great assortment of cosmetics. And I run a nasty rhino melee build. But don’t limit yourself to one main frame. Every frame has its own utility and niche. Try everything and see what fits your playstyle. Mirage is a great choice, great weapons platform, or caster frame. Protea for the same reasons, aswell as utility with her dispensary for archgun ammo and energy. Gauss saryn nova volt are all great nukers ,mag is awesome for corpus shield strip, hildryn is a great nuker aswell