Welcome!
About the tuners, the "best" one depends on how blingy you want your truck to be... The 3 different types are only different on the outside. They can all run the same tunes and show the same PIDs last I checked. The CTS is a touch screen and it has a backup camera available, the CS is in color, and since you have an 08 I am pretty sure they have original monochromes available. please post any other questions in the appropriate part of the forum, thanks!
