As an owner of a 9.25" SCT and 16" dob, I would say I prefer the dob. However, the difference varies. You see I can put the cooling fan on my dob several hours in advance. My SCT is a standard Celestron, not an EdgeHD that has quicker cooling. So, if I am patient and use my SCT around midnight - the results are quite good.
My SCT is more expensive than my dob, and in terms of bang for buck - the dob wins.
To those who prefer refractors - yes I agree they are wonderful. But comparing my 16" dob to a similarly priced 110mm refractor, and I still prefer my dob!
That's my opinion anyway.
