<p>Want to upgrade my 8 year old Mac book (13") to a newer machine, at least 15". Considering either Mac Book Pro 15" or iMac 21" - mostly because I use Apple products - iPhone, iPad. Not adverse to PC, but prefer Mac environment. <br> Relatively novice photographer. Would be using Lightroom, I believe, to digitally develop photos. <br> Thanks for inputs</p>