Dexcool is a marginally better coolant specifically developed for aluminum too. It will stay liquid over a long time over the green stuff which will turn to a higher viscosity and even gel at worst. Of course those considerations are more for people that drive the hell out of a car and rarely service it. I've found more cars with blocked aluminum radiators than copper ones. I feel they might clog easier than copper. But if you service and flush your system there should be no problems with either. I mean I wouldn't drive a car 50,000 miles before flushing/changing which is supposedly "normal" these days.