Here you go...
Less bandwidth = more contrast.
5nm is best when used under light polluted conditions.
3nm O3 can be used successfully under bright moonlight.
3-5 nm cost a LOT more but are well worth it!
Top of the range are Astrodon & Chroma, but Chroma represent considerably better value than Astrodon for exactly the same quality.
Bottom of the price bracket - ZWO, Optolong etc. produce haloes around bright stars
= You get what you pay for!
Hope that's useful.
Cheers
Andy