So seems like the Livewire is the best then?
If having the most features makes something the "best," then yes.
The SCT Livewire TS and the SCT X3 (being replaced by they X4) are going to do the same thing for you from a tune/driveability standpoint. The Livewire has a color LCD touchscreen, is easier to use, has a few more bells and whistles, and is also more expensive. If you only want a tuner, get an X3/X4. If you want a tuner and the ability to display vehicle information and/or additional camera inputs, get the Livewire.
I do believe the new X4 is going to include a windshield suction cup mount like the Livewire, so I guess you could use it like a Livewire if you wanted. The X4 isn't as aesthetically pleasing as the Livewire, so if I was going to keep it mounted full time I'd get the Livewire.