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I have an 8" Newt and a 4.5" refractor. The refractor shows greater contrast and a 'crisper image', while the newt shows more detail but with less contrast and a slightly softer image. It can do your head in trying to work out the trade-offs!!
Personally I prefer the refractor, but as noted, a good one gets expensive very quickly.
If you are in the position to get one, one of the 'Intes-Micro'
x15 series of Maksutov Cassegrains are reputededly excellent for planetary viewing, without giving a lot away for deep sky.
They have a small (c.25%) central obstruction and an f15 focal length. The 6 & 7 inch seem reasonably priced for what they offer.
Have a boo at tetontelecopes.com for more info.
I have no connection with either company. Its just what I've garnered from reviews and gossip.
Peter
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