It's the same examiner and, as far as I know, the same wait time. Unless there's some internal paperwork difference I'm not aware of.
More importantly, considering it's taking so long these days, even if there was a difference it wouldn't be much. There's almost no market for used NFA items, so most likely you're going to have this gun for life. Even if there was a difference in wait times (and I don't think there is), you should pick based on which one you want more, not which one might take less time. I vote get the SBS.