Retroblast is just plain wrong. They are not identical, even to an uncompetitive player. X-arcade sticks use levered joysticks with different switches and joystick shapes. The comps use a square acuator with cherry switches.
IMO 99% of the fighting game comunity prefer Happ/IL comps over X-arcade joysticks. The most comon reasons stated are a smoother rotation, that feels more circular, ease of doing half and quarter circle motions, and better microswitches.
If anything, the X-arcade is an imitation of and is similar to the Happ Super joystick, which is a less popular joystick. The benefit to those are that the acuator can be inverted to switch the joystick to 4-way mode. For fighting games they are functional, and hardly the worst joystick, but rarely used outside of arcades where the OP either didn't care or was oblivious to the difference.
As far as any Happ joystick being better, yes, in my opinion, any single joystick available on Happs website is better than the sticks that come in X-arcades.