Here is my take for visual...
A good UHC filter is a helpful tool to help pull out some types of faint fuzzies.
A good OIII filter is also a useful tool to pull out some different Deep Sky Objects.
While a CLS (or similar light pollution filter) will work as advertised (with appropriate expectations set) it to my mind is not as helpful as either the UHC and OII.
I have all three and the CLS does not get any use anymore. I've written at length on my advice and experiences in other threads here so I won't repeat it all here...in summary, instead of a CLS invest the money in petrol and get to a darker sky.
The Astronomics filters are very good in my opinion...expensive but good. I am also exceptionally fond of the DGM Optics™ NPB Nebula Astronomy Filter
From their website:
The NPB (Narrow Pass Band) filter is an Ultra High Contrast type of filter that is very effective for small and fainter emission and planetary nebula and a variety of bright nebula, especially through larger scopes. Another nice feature of the NPB filter is the very natural coloration yielded by this UHC type filter. Star images retain a much more natural color, in addition to pinpoint star images. High transmission at the 656.3nm Hydrogen Alpha emission line is a bonus for this design.
http://www.omegafiltersebuyer.com/se...ontrast/Detail
I have both their (DGM Optics) NPB and OII filters as well as an Astronomics CLS...I used to have an Astronomics UHC. When I compared the DGM to the Astronomic I found I preferred the DGM (very slightly) and at the time it was much less expensive than the Astronomics...I kept the DGM and sold the Astronomics for a reasonable return. The Astronomics is a very good filter too and I know others that preferred it to the DGM.