Ra97oR,
As hifidk has stated, not many people will have had experience with AD1000, yet alone both.
I have the AD900 and the ESW9 and I can tell you they are entirely different. The ESW9 can't compete on the soundstage, as you would expect. Sound quality is probably similar, however they have quite different sound signatures. You say that size doesn't concern you for portability, however the ADxxxx are huge and leak a fair bit. It is difficult to get a headphone that excels in portable as well as at home, sometimes you just have to compromise a bit. The AD1000 are said to be quite treble focussed. The ESW9 is a great fon, however there are certainly full sized open fons that arguably perform better on decent home systems, in regards to detail and soundstage. I think they hold their own in most cases, well ballanced sound to my ears and they do have good detail. Soundstage is good for a small closed fon, but not in the league of decent full sized open headphones. I can't comment on the hinges, I can only say I have had no issues, however I look after my headphones. If you are hard on your portables, you still may be better off saving for a second cheaper pair, and going for something like the AD900 for home use. The few I know that have tried the AD900 and AD1000, prefer the AD900. Good luck with your headphone journey.
Edit: Having just litened to my ESW9 straight from a DAP, they are a such a fun sound, very complete and engaging. Could I live with the ESW9 if I were only to have one fon, you bet. But I don't have to, so I will keep my DT880s, DT150s, etc.