The 9 x 50 would probably make a better guide scope having more aperture. A 6 x 30 is pretty undersized in more ways than one as Joe says.
Not knowing what the rest of your setup is makes it hard to suggest best guiding solutions. On equatorial mounts just tracking is good enough for visual. Astrophotography requires guiding to manage various mechanical and alignment errors for long exposures. Even planetary or lunar video can be done just with tracking.
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