Hi Skirmy,
If you will go back through the previous posts for a month or so, you will find volumes written about the relative merits of these three units. Mostly it boils down to which one best suits your own needs. They are all three fine keyboards.
The Technics and Yamahas are easier to learn to operate than the X1. Each has its own outstanding features and, of course, its own drawbacks. These features have been discussed repeatedly fairly recently. Good luck with your decision. You can always find help here.
Don