Watch the The Brush Technique online guitar lesson by Ben Lacy from Two-Hand Groove Guitar
Here's the 3rd technique. It's maybe the most like a guitarist would be naturally thinking in a band.
I use the middle finger most often. It's just a nice upstroke, but with the finger instead of the pick.
Bend the finger up at the knuckle and come across the string. Hit with the fat of your middle finger. Almost a sweep-y technique.