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G'day Neil. I enjoy using filters so much I put a filter slider in my Dob. I've done a few side by side comparisons using the slider.
You don't say what size scope you are using. The H-Beta is generally very narrow and will make the image quite dark in small apertures. They do help a lot in finding the Horsehead, but just as important is a very dark sky and obviously the bigger the telescope the better.
A narrow band/UHC is a good all round filter and will work in any size telescope to increase contrast. That's usually a good one to start with and then get an OIII next for a bigger boost in contrast.
You mention M42 which does look great with the UHC/OIII but my personal favourite is the Carina Neb in a widefield. Very nice
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