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I bought a 1.25" Televue diagonal, and was darned if I ever saw any real difference between it and the Celestron diagonal that came with my C8.
I have an ultra-wide 23mm Luminos and it is a really heavy eyepiece that delivers a very nice wide field of view. But its eye-relief is necessarily shallow compared to a narrower field eyepiece (could be a nuisance if you wear glasses).
As far as wide angle eyepieces go, you see pretty much the same field down in power to around a 25mm eyepiece, regardless of whether it's a 1.25" or a 2" eyepiece (though the image at the very edge of the field may be better for the same price in the 2" eyepiece).
If you want a wide angle view at say 27mm, 32mm or 40mm, then you need a 2" eyepiece.
2" diagonals are more awkward to use, because you keep having to screw and unscrew the thread in the visual back to move it around, and do it up tight, and especially very tight when you have a very heavy eyepiece.
In contrast, a 1.25" diagonal with a lighter eyepiece is simple to reposition just by using its screw.
I happily did all my galaxy and planetary nebula hunting with the more convenient 1.25" diagonal and 20mm wide angle eyepiece. Though for looking at star clusters and other rich regions of the sky, I do enjoy using the 2" diagonal with my 23mm and 30mm ultra-wide angle eyepieces.
Regards,
Renato
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