I will give you my experience. I have been with Adsense for 19 months. I have been with the Ad Program for 6 months and have made approximately 2.5 times as much with the Ad Program in one third the time. If I had to go with one program, it would be the Ad Program, but I have made about $100 with Adsense which is good in my eyes. They are both good programs.
If you are asking how much an individual can make, the answer is as much as you want. It depends on how many hubs you write, how many places you write for, and how good the articles are.
Hope this helps.