If you don't have any weeds, don't use weed killer. In general, the weed and feed approach is not the best one, anyway.

It's better to fertilize, then two weeks later, spot spray any weeds with a broadleaf weed killer.

What kind of grass do you have? How hot is it there? Did the spring app with crabgrass control have fertilizer or was it just the crabgrass control?

Generally, you don't want to fertilize cool season grasses like Kentucky bluegrass (KBG) or turf type tall fescue (TTTF) when it's hot because they're better off not growing fast at that time. If you have cool season grasses, your best approach for a fertilizeer schedule is once in late spring and twice or three times in the fall, with the last one being after the topgrowth has stopped but while the grass is still green.

The brand doesn't really matter, it's teh amount of N, P and K you apply. Many lawns really only need the N (the first number) because if you mulch mow, the P and K stick around.