The FOV Stug is a Stug III, based off the Panzer III chasis, while the 32x stug is a Stug IV, based off the Panzer IV. You can tell by the number of road wheels, as well as the shape of the tank. Theyare thus different vehicles
In my experience, FOV Enthusiast products often look better next to their 32x counterpart. The FOV vehicles usually tend to have better weathering and often better detail on the mould (for instance, both the FOV Tiger and King Tiger have the zimmermitt moulded on, whereas the same 32x tanks do not.) Other 32x vehicles hold up well.
Still, I guess it is in the eye of the beholder. Although I like the current 32x Stug IV, I'm not as wild about its tan & green paintscheme. I don't have an FOV Stug III, however, I think that my 21c version would not look as good sitting next to it. The 32x Stug IV in the ambush scheme looks much better, but doesn't have the side skirts or opening commander hatch.
I know this is a mouthful, but I hope it all helps
