Well, of course this is just my opinion, but i wouldn't hesitate to buy the deere.
Ive had a case/ new Holland 850k/dc85 for years now. Nice machines, but they have very temperamental electrical systems! They seem to have constant fuse and relay issues. I've seen and personally posted issues about electrical issues.
Now my experience with the deere dozers are that they are more expensive and for good reason. They are built very well. I've run cats, deeres, cases, new holland, and komatsu dozers, and you can immediately tell why the costs are so different. Cat is built like a tank. Id say deere is next as far as heavy duty. Komatsu next, followed by case/ new Holland. Much more plastics and lighter duty steel in frames, doors, handles, i can only assume the same goes for the rest of the components used to build the dozers.
If you can afford the extra cash.... my 2 cents is DEERE.