None as they are both rubbish. I have not had one Job off a service like that EVER and certainly wouldn't waste my cash again. I was warned by friends, tried it anyway and have nothing to show for it a year later myself.
The only call i have ever had through one of these services was a person down south looking for advice about setting up... Says it all really.
Thats why all the stock image sites by the same companies are popping up, they know people have figured them out and they are becoming irrelevant so need a new income.
Sorry to be blunt but these companies are just leeches on our backs and commercial operators.