Depends.
For acoustic, I use a Stephens "The Switch" cable. Picked up a couple of them years ago. I don't think they make them anymore or at least haven't seen one in I can't tell you when. They were the first cable I ever saw that has an on/off switch on it. That way, when I take off the acoustic and set it on the stand behind the piano (I was playing a regular church gig back then), I could turn it off so that it wouldn't start with any sympathetic vibrations during the rest of the service. The guitar I used back then was an old Martin that just had an under saddle piezo with no volume control.
For electric, I started using
Pig Hog cables about three years ago. They seem to be good quality and are easy to use (they don't kink or anything). Walked into the local mom and pop that opened up the street from us. I looked around, but didn't see anything I needed, but I always tried to pick something up just to keep them in business (didn't work, they only lasted a couple of years). The kid manning the counter suggested them, said they were all he used and were the best cable ever, so I grabbed one. They're all I've used since.
For patch cables between pedals, I've got a bunch that I got from my local Radio Shack store before they finally closed 6 or 8 years ago. They're the usual, low-end, cheap cables that you could grab off the RS wall and walk out with a handful for a fiver. But I can't hear a difference when I use them, and they've lasted a LOT longer than I expected.