I've done salvage as crappy blu and crappy bst, bst was slower and more annoying waiting for JA timers, blu just spams w/o timers to worry about. my bst has maybe 3-5 JPs blu maybe 100ish now.
if you alrdy have bst then use that for farm, if you don't have bst or blu, I would recommend blu over bst because overall ease and simplicity of the aoe kill function.