When I last looked at the EdgeHD 9.5 there were few adapter options than for the other SCTs. Third party companies go by volume of sales in producing components and in the past the 9.5 was evidently not as popular as the 8 and 11 OTA. In my case I was looking at it in terms of astrophotography and not purely for viewing. At least in terms of sales by OPT of Celestron OTA the 8" is still the most popular followed by the 14 and then the 11 inch. This has an impact on available add-ons and on potential resale value when you decide to sell it.
Not only will the 11 or 14 OTA be itself much heavier but it will require a heavier mount and a heavier tripod or pier and more counterweight will be needed, and it all adds up.