All other things being equal, 12" is much better than 8", Pat (I had an 8", then went to a 12"). It's also better than 10" but not as marked a difference.
If the question is simply what the view of DSOs is like (leaving out price, handling, transport etc.), than more aperture is usually what people want and enjoy.
Go with the largest aperture you can afford and handle, but start saving more money - you will want those eyepieces and more in future.
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