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Ok... Both C9.25 & Meade 10 are f/10 scopes true, but there is a difference... And that is the figure of the mirrors. The C9.25 has a f/2 primary & a f/5 secondary. The Meade 10" has a f/2.4 primary & a f4.2 seconday (or there-abouts).
Because of the the C9.25 has a slightly smaller secondary.
You won't notice the difference in aperture when viewing unless you have an exceptionally steady night and crank the magnifaction power up.
What you may notice is that the C9.25 will give slightly sharper images, and hence this is why it is more popular for astrophotography. However you'd have to have a pretty keen eye to notice this visually....
Both are nice scope and you'll be happy with either. Most importantly once you have decided make sure you get a decent mount! Nothing can ruin you views thorugh a good scope more than a crappy mount.
Good luck.
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