From what I've seen at UPS lately, it's mostly military guys, furloughed legacy guys, and other guys with time in Boeings. You do still get the RJ Capts, too, and I helped one get hired a couple years ago, but I think the heavy time makes you stand out more so than being just another RJ Capt. Also, checkairmen stand out, too.
Anyhow, if it was me, I'd take the heavy job in a heart beat as a better career move. Just waiting around for the legacies to start hiring again and waiting for them to get to my number would take too long. Plus, I think the heavy time will look better to the legacies as well, so long as you got that 1000 PIC turbine out of the way.