Sorry, I'm laughing.. I hope you'll tell us why you're asking.
The 10" by far. Only possible reasons to choose the 127mm are
portability or ability to put it on an equatorial mount.
Bill Kocken

I'd like to hear your opinions on whether a 127mm Orion
Maksutov-Cassegrain is a better deep-sky telescope than a 10" Orion or
Hardin Dob that is now on sale for about the same price. Don't laugh I
have a very good reason for collecting this information.

Dave Mitsky