It is fantastic that you built both of those.
Many years ago, when I belonged to an IPMS club, a number of members claimed the Alan/Dragon Su-76 is the worst model ever made. To me, it looks like every other 1990s tank model but I regularly run with the joke because it gets laughs. 
Before reading Ryan’s response, my guess was Alan/Dragon on the left and ICM on the right. Details on the right vehicle are more petite and better defined. Both models are very well done examples of the ‘dirty tank’ style and remind me of your diorama with the Bogward.
An experienced model builder can win with anything if the will is there.