I have owned most types of scopes and I like then all but I have a soft spot for the sct. I own three scope as of now a Orion 14 inch goto dob a Celestron 8 and 6 sct and I have to say I use the C-8 most of the time its just a easy scope to set up and take down, it ride on a Nexstar SE mount and the C-8 show me most all the things I like to look at. I got the C-6 thinking is would be a good grab and go scope which it is but I have found the C-8 is also a great scope for that also. I love my Orion 14 but its just a little more trouble setting up and taking down but gives great views but its big and heavy lol. I have a funny feeling now at almost 68 years old the C-8 could up being the last scope I own in the end , even though I have to confess I have never owned a C-9.25 sct I am wondering what that would be like on a Evo goto mount would it be to heavy and would the views be so close to the C-8 that it would not be that big of a deal? Oh well there just always going to be one more thing lol.
I have owned and used both the C8 and the C9.25 for many years.
The views are close but there is definitely a difference in resolution and field illumination. For example you can see the difference on globular clusters and planetary / lunar performance. It is not huge but most things in this hobby are subtle so that is relative. We get excited over differences that non-astronomers cannot even perceive at the eyepiece. : )
I also find that the C9.25 presents a slightly flatter field visually as well as photographically with better field illumination for imaging. A lot of people claim this is not true but to my eyes (with nearly 2+ decades of experience) there is a significant difference. My imaging cameras also quite clearly show the difference.
If you are visual only and have a very good C8 with the newer XLT coatings I would recommend you stick with it as the mounting requirements for the 9.25 are different. It just tips over into a larger category which requires a much heavier / sturdier tripod with the Evo mount. For some folks this is ok but for me it noticeably changes the portability of the scope. This is why I still have a C8.
And I can tell you this... Many scopes (some very premium ones) have come and gone but I have always had a C8 and it is a scope I will own till the end. That scope to me is just the most optimal balance of aperture, portability, ergonomics and versatility. And now the EdgeHD version has just made it even better as I can do imaging to my heart's content and enjoy refractor like views with my widefield EPs.
Hope this helps.