I'm planning on going the SBR route in 9mm and was wondering which size dot from Docter Optics would be the better choice given the short ranges this rifle is designed for?  Is it much quicker to acquire the larger, 7.0 moa, reddot?  Sometime in the next year I will also get a short barreled 5.56, and thought the 3.5 moa would be a better choice there.  Can anyone shed some light on this?  Thank you.  

I've got a 3.5 Docter on my TA-01 and the dot seems plenty big for CQB work.  In my opinion the big 7.0 MOA dots are really for handguns only.