You will see a significant contrast boost especially with a narrower bandpass line filter such as an O-III under polluted skies. The UHC is a good choice as it passes O-III and H-Beta but given your sky pollution I recommend the O-III for greater contrast. The O-III is best all round line filter for most nebulae.
I also recommend the Lumicon O-III but you cannot go wrong with Astronomik or Tele Vue. Thousand Oaks is good too but transmission is a little lower at least on the sample I have so I think it is better on a larger aperture telescope (background is jet black though in 10.1” giving very high contrast!). I have all of these but the earlier Tele Vue not the latest Astronomik version. I do like the very natural look of the earlier Tele Vue O-III but my preference for a pure O-III line filter is for the Lumicon O-III. (My filters are about 8-10 years old). My recommendation is based on use of the above through various telescopes but mainly a 10.1” f6.4 Newtonian. I understand the new Lumicon O-III Gen 3 and newer Tele Vue (Astronomik) filters are very good based on reviews online but until I get these I cannot comment further.
See
https://agenaastro.com/articles/guid...n-filters.html
See also
https://www.televue.com/engine/TV3b_page.asp?id=24 and
https://www.televue.com/engine/TV3b_...d=24&Tab=_spec
See also
https://farpointastro.com/?s=O-III&p...ct&dgwt_wcas=1
See also
http://thousandoaksoptical.com/products/nebula/
I’m not sure what eyepieces you have but you can start with a 1.25” version to test under your conditions and then later get the 2” version if you like it. Both are useful. Some users will suggest you get only the 2” version and a 2”-1.25” threaded adaptor; I won’t recommend this and neither does Tele Vue and that is why their adapters are not threaded. Reason being one day you’ll forget there’s a filter in your adaptor and put a 1.25” Barlow straight through it. Use the filter size to match the eyepiece barrel size. I bought 1.25” filters of various makes and types and then bought 2” versions of the ones I liked most.