I use S&B and CCI Blazer mostly as my range ammo. Sometimes I grab some Winchester White box at Wally World if I need some more ammo quick.
All of those get a bad report on the forums now and then. S&B has a red laquer sealant that supposedly jams up some guns, Blazer has aluminum cases (most probably don't like it because it isn't reloadable), and Winnie White box has spotty QC.
I agree with the poor QC on the Winchester so I don't use it much, but all have been consistant, reliable and accurate for me in various calibers. With the price of Blazer being so low, that is what I've probably shot the most.
I have also shot a little UMC now and then. I've never had trouble with it either.
Edit: Just remembered, I did had some trouble with .38 Special CCI Blazer in my S&W Model 28 .357. The slick cases were sliding back on recoil and jamming the cylinder. I shoot S&B in that one now. I gave the rest of the CCI .38 away to a friend with a K-frame who shot it up without a hitch.