Really depends on the SMG and ammunition used. As Reservoir said most SMGs ingame right now are the mechanized pistol type-- e.g TEC-9, MAC-10 and the Pipe SMG.
With something like the FN P90 or MP5 you could feasably expect a bit more accuracy with single shots over a longer range, but then you’re limited by accuracy, recoil and ammunition-- 9mm +P+ really is a massive change compared with standard 9mm for example.
You’d be better off grabbing something like the Ruger or Marlin for anything at range and then switching to a heavy pistol or SMG for emergency close in work, because things like the TEC-9 shred anything at close range.
Edit: Oh and yeah, Burst. If you want to hit anything at range, don’t use burst.