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Newts usually have fast focal ratios of 4-5 and is best value for money in terms of aperture. Being a fast scope, it also means it is very forgiving in terms of tracking errors and so on. On a newt you need less time to expose DSO compared with slower SCT (usually f10) and refractors (usually f6-8).
For visual purposes, DSOs also show up much brighter in a newt.
I had a vintage 114mm newt and the views I get on that is better than my 200mm SCT.
The main disadvantages of newts are its open tube and the need for coma corrector for the fast ratio, but other than that, I'd recommend newts over SCT if the scope is permanently mounted (SCT are good travel scopes due to their compact size and sealed tube).
My 2c.
Bo
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