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Its really up to you...if you dont plan to do any custom tuning, look for the one with the options you want right out of the box, ease of use, and available support should you need any
I have diablo & love it. But i think you should pick the tuner device that dyno shops in your area support. That way when your ready to get a dyno they can upload the tune into your device & it'll save you money.
Thats a bold statement to make with the Diablo Tech manager right here on this forum
like i said Statisticly proven by me and i am bias since i am a sct dealer but it was not to offend you or any one from diablo sport... in the end it is personal preference since they both do the same things, and change the same things