Personally I don't use a DSLR because they are large, but i do use a professional camera and I can say, hands down, that after you achieve a level of quality for the photo, the control you have over the camera is the most important thing.

You cannot get a decent amount of control with a phone. Want to shoot at 1/15 and get partial and intentful motion blur? Want to do night time street photography, shoot at 1/60, 2.0f and cap the iso at 3200 max?

A phone may be OK for a selfie, but any kind of real artistic expression beyond really basic photography concepts and you won't get far.