My only problem with the compact was missing the higher end gear. I was finding that I was gearing out on downhill sections. This was a big issue with me especially when trying to hang with the boys in group rides since I don't have near the weight they do to fly down those hills. Just something to consider. I currently have a triple with a 52/39/30 and it suits me perfectly for both flat and hilly rides (I am over forty and do not have young knees). I would take both for a really long test ride with varied terrain if possible before you make your decision. I think what it comes down to is what will work best for your riding style. Oh, and +1 on getting 105 or better components!