I can't answer that question directly, but I can point out one difference in high end stand-alones worth considering before purchasing an expensive and time consuming installation.
One of the most important factors that drove my decision towards the BS3 was the state-of-the-art injector drivers. I was worried that I would not be able to idle and cruise without tune issues when I went from 30# injectors and ~420 rwhp to massive injectors pushing ~1000 rwhp. Accoding to reputation, the BS3's injector drivers are precise/fast enough to control 160# injectors in street cars. I have 120# injectors in both of mine and can lean the car so far out even at idle that it stalls. My understanding is that this is not possible with some of the aftermarket systems. I'd imagine this is especially true of the high impedance injectors with stock drivers. I have seen plenty of folks that do ok with 42# injectors in street cars with the stock computer, but when you want to make 700+ rwhp using 80+ # injectors and you still want to putt around town, you'll want a good system. Before I bought my next stand-alone, I'd get a good idea of how well it controlled big injectors. I might be out of date. I don't know if the new systems are all on par in this area, now.
One of the most important factors that drove my decision towards the BS3 was the state-of-the-art injector drivers. I was worried that I would not be able to idle and cruise without tune issues when I went from 30# injectors and ~420 rwhp to massive injectors pushing ~1000 rwhp. Accoding to reputation, the BS3's injector drivers are precise/fast enough to control 160# injectors in street cars. I have 120# injectors in both of mine and can lean the car so far out even at idle that it stalls. My understanding is that this is not possible with some of the aftermarket systems. I'd imagine this is especially true of the high impedance injectors with stock drivers. I have seen plenty of folks that do ok with 42# injectors in street cars with the stock computer, but when you want to make 700+ rwhp using 80+ # injectors and you still want to putt around town, you'll want a good system. Before I bought my next stand-alone, I'd get a good idea of how well it controlled big injectors. I might be out of date. I don't know if the new systems are all on par in this area, now.