Short refractor gets my vote as well.
I have an NEQ6, same/similar mount as you. I also use n this mount a 10" f5 newt, albeit it is in a C/F tube, but the mount handles it OK. I have used a separate guide-scope, plus an OAG, with the OAG being "better".
But if you are starting out I reckon not to complicate things too much, so the refractor is simpler and easier to operate. In my case a 100mm or so, with flattener, and then get a flattener/reducer. I use an ED102 (612 focal length) and additionally reduce this with an 0.8x reducer, so get just under 500mm as well from the same scope.
Gary
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