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Aaahh the Hatfields and McCoys are at it again.
The only major point you've raised thats valid Paul is the tube length, because of the folded design the SCTs ,they are more compact and portable for the same F ratio.
Newts can be any F ratio you want to make them. So no , The SCTs dont win hands down, as an F10 cat or newt is still F10, except that the newt has less deterioration imagewise because of the optical configuration,and a longer and more difficult to use tube. An off-axis newt takes it one step further and deletes the coma problem fairly well and reduces the central obstruction completely.An Off-axis newt doesnt have the CA problem associated with a refractor either, which puts it in a more accessible range financially than a top of the range Apo.
But optical performance is only one part of the equation on which scope is the right scope for an individual . Portability , ease of operation , price, storage and a host of other points need to be taken into consideration.
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