The real answer is you do both depending on the situation. My best hourly has been doing per-project billing, but you need to be smart about it or you can end

The real answer is you do both depending on the situation. My best hourly has been doing per-project billing, but you need to be smart about it or you can end up working some hours for free. Hourly T&M is a nice situation to be in since it takes a lot of the risk out and lets you just focus on the work that needs to be done.