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Robert, I have spent months research this very issue. Albeit slightly different. I am in two minds between the 9.25 and the 250 mewlon. Cost is a significant factor and ease of service is another.
That being said, I would rather the 9.25 mainly because people like Damien Peach, do use this scope and get fantastic results. In fact I would have to say that he is the best planetary imager in the world. His images of Jupiter are the best I have ever seen. Bird is right though, cooling makes a significant difference. My scope is permanently mounted outside with a cover over it. I have noted that this keeps the scope permacooled and helps with my imaging efforts.
I think the 11 has some advantages like image scale, but cannot compete with the specific optical design of the 9.25. Chris Go of Singapore is now using his 11 and I think the images look blurred. The 9.25 is I believe the better tool for planetary work.
Although, many things like collimation, and seeing make so much difference to an image. Personally, I think the Mewlon is rated very highly and would love to own one over the Meade I have. I am sure that given practice and the right camera your images could rival the best. Don't buy the 9.25, buy a better camera and a day star and your images will be out of site. The images of Jupiter that you exhibited are very good, but with the right camera they could be brilliant.
Keep the Mewlon you are onto a winner.
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