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When I tried out the filters from DGM I wasn't aware of them making any H-Beta filters, just the OIII and NPB. I like the filters from Lumicon, and their H-Beta is very good.
I've asked widely about using filters in the APM binoculars, and the response varies. Some prefer the un-filtered view, others like using filters. I guess you need to try for yourself. I think the best option is going for the DGM NPB or Lumicon UHC as the best all rounders. As far as using just one filter, I'd have to think about that one. I would have gone for one in each eyepiece.
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