8" Dob vs Celestron c9.25

I have an Orion xt8 Dob which I have done some work do:
flocked the upper and lower sections of the tube.
replaced the stock secondary with a 1.53 Discovery.
extended the primary mirror distance to get a closer
focusing point with the eyepiece.
I have to say the views are excellent.
How much better would a good c.9.25 with starbright, not
xlt coating give me, if any for general viewing.

I have sold my c8 with xlt coatings which also had good otpics, because the 8" dob was better for plantary and deep sky.
Thanks

How much better would a good c.9.25 with starbright, not
xlt coating give me, if any for general viewing.

My experience comparing an 8" Newt with a C9.25 is that the
SCT is much more susceptible to thermal problems like
warm air pooling in the tube, and slow cooling of the primary
mirror. In the Newt you can easily mount a fan in the back
to accelerate cooling and/or draw ambient air through the
tube. In the SCT, unless you are going to cut holes in the
tube, mount fans inside, etc., you are going to be fighting
some sort of thermal problem much of the time. You can put
the scope outside couple hours early to cool down, but many
nights when the temperature is dropping steadily, it never
will stabilize. I don't see the C9.25 as an upgrade, unless
you can somehow address the thermal issues. Thermal stuff will
depend somewhat on your climate -- I see you are in NY which is
probably not very different from here in MD. If you were in
FL keys or some small island in the middle of the ocean where
the temperature is pretty stable, it would be much less of an issue.

The C9.25 has a much larger obstruction, which would have some
impact on planetary contrast, but I see that as a more minor issue.

Optically the C9.25 I've used is very nice. It's not a question
of optical quality.