I've owned both. Here are the differences:
- Better ergonomics for me (more comfortable to hold, GT trigger guard cuts into my finger)
- Better trigger (I couldnt get enough forward travel out of the clone trigger. Even with the critical trigger I still prefer the luxe)
- A little bit lighter
- A little less temperamental (the GT drivetrain has a ton of o-rings, most are static but there is more to worry about)
- Better efficiency
- OLED board means you can actually see the settings instead of deciphering morse code
They are both great guns, that shoot very similarly and you wont go wrong with either. The lack of efficiency on the Luxe hasnt been an issue for me and I placed more importance on the ergonomics so the GT has been sold for now. Pooty shaves down the GT trigger guard, so maybe that's an option in the future. Hope this helps.