Which airsoft gun should i get next?

so basicically i starting over, im selling my ak47 and my m28 for more money for a better gun all together, my ak sucks and i just dont use my m28. i was looking at 3 perticular models, whats the down/up sides of each gun and the best of the 3. echo1 full metal mk16, umerex mp5a5 by g&g, or kwa g36c? (i want something customizable and mobile, i love the m4s but all my friends have one and i want to stand out from our group)