I, for one, would probably go with the 130mm, f7 Newt, assuming similar levels
of optical quality. Though it would be the bulkier of the two choices, the
main benefits that I see are the larger aperture, which will pull in more light
and provide increased resolving power, and the modestly shorter focal length,
giving a somewhat wider maximum field of view, and, I'd bet it would cool down
to ambient temperature more quickly than the MCT, though neither should be
particularly bad in that regard.

That said, the Newt would be, as I said, a somewhat bulkier package and would
require more "maintenance" in the form of collimation and (very) occasional
cleaning of the mirror, which would be relatively open to the elements, at
least during use.

So, in short, _any_ telescope brings with it certain trade-offs and neither of
those particular scopes would be a bad choice. For myself, though, I'd choose
the Newt over the MCT, though I'm sure I could be pretty happy with either.
Hope this helps.

Tonya