x2 12, versus wipika amp 14, versus f1 mach 2 12 ???
These are very different kites !
The X2 has the smallest sheeting wind range of these 3 kites.
The AMP14 has much more power than the X2 12 and the Mach2 12 - so this is not the size to compare - you should compare with the AMP 11.8m2 (which still has more power than the other 12m2's here).
Durability, I think, is the same.
And upwind ability is great on all of them too.
The Mach 2 12 has the greatest wind range of these 3 kites, I think (but I can not say 100%, as we dont use this kite much here...), and the X2 the smallest.
Water relaunching is not particulary easy with any of above kites, as they are pretty high aspect all of them - at least I wont say than any of them is easier than the other....
Dont go for the X2, unless you get it REALLY cheap, and can live with the smaller range.
Choose the Mach2 12 or AMP 11.8m2