We are a COBB pro-tuner so obviously I'd suggest a COBB AccessPort. The most important part of a tune is the quality of calibration and its suitability for your intended purpose. The advantage beyond COBB's expertise in developing their tuning platform for Porsche is their network of pro-tuners. The COBB off the shelf tunes are excellent but if you have special needs such as race fuel or modifications that aren't yet supported a pro-tuner can get you dialed in.