There is no point on asking for a source for that statement when you reduce the universe to what is shown or spoken on the movies, especially when the statement involves a ship that appears in no movie at all.
The X-Wing was technically no more than a glorified Z-95 . But the comics and the books put it so much on a pedestal that now it feels weird that it actually doesn't mop the floor with any other ship as easily as it did in those books and comics.
Source? I'm assuming the source for the 'X-Wing was no better than a glorified Z-95' comes from these same 'comics and books'? Because it sure as hell wasn't from the movies.
In any case, my source would be the Star Wars Databank, that listed the Z-95 as a predecessor to the T-65.
And not ALL books (or EU sources) depicted the X-Wing as the "ultimate starfighter".
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So the T-54 tank is just a glorified T-34, because the T-34 was a predecessor of T-54?
Examples are the thrawn novels with mara jades Z-95, the X-Wing games, the clone wars series. The X-Wing got more firepower via its quad-lasers and the engine to sustain those weapons, together with a torpedo launcher instead of the missile one, but that's it basically. It clearly is the better multi-purpose fighter than the Z-95, but the margin between them is not large.
Umm, the X-Wing games had a large discrepancy between the capabilities of the X and Z. The X-Wing had a much better hull and shield rating, and Astromech socket, and the obvious double firepower.