Hi buddy,
there is a simple reason, Belkits are plastic models (according to their
products page) whereas the other models are resin models (made by Renaissance -?-).
BTW, it seems very exciting for those like me who still haven't dare to buy another expensive multimedia resin kit.
A focus WRC from a new french brand, a Peugeot 207 S2000 and a Fiesta S2000 from a new belgian brand, some really good news in plastic models world expected since Tamiya forgot what rally was...
Concerning the quality/interest of each one, hard to say, a plastic model usually offers better and more accurate shape and thickness than a resin model, and plastic is for some of us easier to work with; I saw the resin model, but never bought it (didn't 100% convinced me, so keep my priority on the Clio Maxi, the expected Quattro etc), but he is correct.
knowing a 3 times cheaper solution is now coming, and this new model seems really interesting, it's hard to advise to invest in the expensive resin kits...
Myself, I'll go with the plastic opportunity.
The 207 should be released in October, the Fiesta during next year.