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Haven't used the Vernonscope, I have tried the AP which certainly is very nice. Personally I like the Baader Dielectric 2" ClickLock Hans. It is optically as good as any I have ever used and has the best mechanism for eyepiece clamping of any diagonal.
(Apparently tested to a minimum 1/10th wave accuracy after the coating is applied, other brands apparently test their mirror and then apply the coatings, although much of this is academic as our eyes can't differentiate at these levels of accuracy on a diagonal)
I also use a Zeiss Prism diagonal which is very nice but my reason for buying it was to shorten the light path.
There is a new Carl Zeiss 2" Prism with the ClickLock feature inbuilt but it is big $$$. Telescope Express have it on their site.
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