The smaller scale neck only becomes a problem if you have large hands. Mine are average and i can shred on a Jaguar just as well as an Ibanez.
The bigger problem is the pickups (on both). When using high gain, most notably distortion. I say that because Fuzz' works differently and is definitely more suited to single coil pickups than straight distortion.
As for users, J Mascis of Dinosaur Jr gets a heavy sound with his Jazzmaster supposedly without modifications, just Fuzz pedals. The guy in NIN uses a Jazzmaster as well and my guess is he uses Multi FX and possibly tames the feedback with a 'gate'.
Chino in The Deftones sometimes uses a Jaguar but he has upgraded the pickups, possibly to single coil size humbuckers.
Your best bet is to try the two out in a store, but i'd say the Jazzmaster is more rock friendly even though i'm a Jaguar user.