I have a Bose-X and a Harry Mendelssohn HM40.
The Bose is more comfortable with better noise attenuation - however, it also belongs to work, and I'm often test flying GA types so prefer less noise attenuation.
So work flying that isn't test flying, or long ferry trips: I mostly use the Bose. My own aeroplane, vintage types, test flying, instructing, I mostly use the HM40.
The DC10-13.4 is generally accepted to be the best passive headset on the market. We also use those at work, mainly we issue them to hamfisted crewmembers who keep breaking the relatively fragile Bose headsets.
I tried an experiment a while ago where I took a work DC10-13.4 and my own HM40s on a long trip (Cranfield to Exeter and back in an AA5 iirc) and swapped them over a couple of times. Couldn't tell the difference, on which grounds I will continue to use the HM40s and actually am about to buy a spare set.
At work we trialled multiple headsets for our very noisy work aeroplane a few years ago. The best by a small margin was the Bose-X (this was before the A20 came out), then the DC10-13.4, then a large gap before a selection of other headsets, both active and passive. That was one particular environment, but a very severe one - the scoring was by about 30 users over about 35 flying hours covering sound quality, comfort and a few other things.
My own HM40 set worked fine for 10 years, then misbehaved, and a complete overhaul cost £50.
So, from all of that, I'd say Bose if you can afford it and don't have my personal need to hear all the funny noises, then HM40. DC10-13.4 if you can get a bargain, or prefer to own stuff from a big brand. Personally I'd not look at other brands - Bose are the best in active, and DC and HM budget neck-and-neck on passive. Everybody else is "also ran".
G