I have had both. I had a mustang in college and loved it but it only made it to 108,000 miles, not sure I would purchase another. I currently drive a bimmer and I like my car but damn I have spent so much $$ on it in the last 2 years. I have replaced almost eveything except the engine on that car. If you buy one make sure you have the money to fix it (no more warranty on mine
, and they are not cheap to fix) Personally I like the new camaros.
I am planning on keeping my car for another 5 years if it holds up then likely purchase another one (I like the new hard top convertibles)