DC H10.13.4 is very strongly made and has stood the test of many years production. David Clark headsets are always in demand on eBay so good secondhand market. Spare parts are easily available.
I have not used the HME 110 so cannot comment on it, except to say there are many more DC H10's used in general aviation in Australia and US than Sennheiser.
The DC will take a lot of use and not have any problems.