Hi Chrome, they both just look very similar. Is it the little guns on the front that change the name? I'd nip down to the model shop & pick up a tank model with a decent gun/turret & put that on top so that it actually has some presence.
Or, stick the tiny gun on the upper one on top of the little gun on the bottom one, which at least means that one of them has better than a 30 degree arc of fire.
Or would that not be in the spirit of the fluff?
Are you going to have any soldiers sticking their heads out of the top of the hatches?
I'll vote for the bottom one though, the main gun should surely be bigger than the spares on its side?
Cheers, B.