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Personally, I'd take the newt over the cass any day. That extra 1" of aperture is not likely to be noticed and the larger central obstruction likely to become more of an issue than that extra 1".
Mostly however, Cass scopes are far more likely to have thermal issues than a dob. If you put in aftermarket fans into a C11 it can cool down reasonably well but I know that my 10" LX200 really struggled in winter, it just couldn't keep up with the falling temperatures.
If you're able to regulate the temperature of the telescope while it is permanently mounted and install Tempest Fans to help regulate temperature it may be able to keep up with a newt. From what I have read any secondary below ~20-25% has little to no effect in image contrast where as a C11 has something along the lines of a 35% secondary.
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