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Hey Marios. I have all those filters. They are very different to each other. The OIII is about the narrowest visual OIII filter you can buy at only 10nm. On the other hand the UHC is one of the widest narrow band filters around. I haven't used my moon and sky glow yet, so can't comment on that one. But I did buy it for planetary observing, it's not a deep sky filter really.
Baader call their filter a UHC, but in reality it is closer to a broadband filter and not a true UHC as invented by Lumicon.
Depending on what filters you already have, I can definitely recommend the OIII as a good purchase, especially from a light polluted spot. But before buying the Baader UHC, I would recommend a true narrow band filter such as the Lumicon UHC or DGM NPB. I would see the Baader UHC as a subsequent purchase if you were looking for a broadband filter.
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