Depends on what you want to be able to do. Look on the diablo web site and see what each is capable of doing and get the one that fits your needs. I bought the Trinity for the data logging time and so I could load multiple custom tunes on the tuner. What model and year is your car.
I have a 2014 R/T 5.7 I looked at the web site and to me being new to this game the tuners looked like they both did pretty much the same thing, they both could load custom tunes, it seemed to me the devices was the difference.
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