personally i would rather go for a re-map like mth because it is calibrated for your car and the mods you already have and they will also update it for you at a small cost while a superchip for a modded car is about 400 quid i think I'm not against bluefin just would rather mth but for a standard cooper or one both a quite good IMO i like the bluefin as its plug-in and play and doesn't require any work on your part
while for mth you need a laptop and all the cables to up load it and you can keep the bluefin in you car so you can reset it when need i.e if mini service come out to you etc