that's just not a fair comparison. despite how you may feel about angel investors as a whole, working part time is not equal to working full time. you can accomplish a lot working nights and weekends, but it's generally difficult work, not nearly as productive, and does not have the same urgency -- it's very easy to take a few weeks off from a part-time endeavor, or just to stop working on it altogether.

we've also been very happy working with angels, but it might just be that we've been lucky enough to have great investors.

based on my experiences, i would highly recommend finding a way to work on your business full time as soon as you can.