I'm looking into getting either an iMac or a rMBP 15". More specifically the 2.6 rMBP, 16GB, 750m or the 3.5 iMac, 780m (I would probably upgrade the ram myself to 16GB and opt for the flash storage). The portability aspect aside, what are the realistic performance and thermal advantages that the iMac has over the rMBP? Will I really notice that much of a difference on the iMac? Mostly doing Adobe CC design work, photography, web design and some app development.