I don't think too many guys run these on oval. I know a guy that posted here use to run the JRXS with a conversion kit on from I think Extreme racing.
I think both have advantages but overall both are very adjustable cars so go with the one you like more. I think in time the Losi will be easier to get parts for but I'm big into buying the car you like better. You can make either work well.
Castle Creations (Since 2005)
Bumps & Jumps RC (One of the best racing facilities around)
ST Racing Concepts (STRC) Great aluminum upgrades for many brands.
Custom Works (Best Oval Cars around). Too many titles to list
Shout out to: Sticky Kicks, CR Graphics and Race Ready Products