Debit/Cash always. We have one active credit card, though never use it. Once we're better off financially, I'd really like to look into the cash back/rewards program that many credit cards do, but wont even look until I'm absolutely certain that we'll use it wisely.
I use credit card for almost everything.. but then everything is paid off at the end of the month. we don't carry a balance forward. We're happy to accrue various points or other advantages (dollars back for food) and extra $$ off of a tank of gas a month...