Maptuner you can change tunes on the mountain without wifi, you do need a battery (like ibexx) or you can plug into a USB port on another sled to get power. Maptuner also data logs and it has a killer monitoring app. Let’s you see what’s happening with every sensor on you sled, AIT, ex temp, throttle position, boost, rpm, volts and many others.
If all you want is a tune and nothing else, maptune probably isn’t worth the extra money.
I haven’t side by side tested tunes, so I can’t say who’s tunes are better.