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You saw the horsehead nebula in a 90mm refractor? That's pretty impressive. Perhaps you mean the nearby flame nebula?
People have different experiences, but my general understanding is that horsie is hard to catch in a 12" reflector. Need dark sky site and averted vision, and careful selection of eyepiece for correct exit pupil apparently helps. Not sure if any particular filter helps. This will be my first season of trying with my 12" - I'm looking forward to the challenge.
I expect that Jupiter will be spectacularly better (in good seeing conditions) - 12" reflector versus 90mm refractor.
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