It really doesn't make any difference unless your DVD player doesn't like mpeg II audio. Going from mpeg II to DD 2.0 probably won't sound any different because it's basically a stereo signal with no surround effects. You may be able to get some pseudo-surround effects, depending on the type of decoder setup you have but it would probably be on the order of Dolby Surround but definitely nothing like DD 5.1.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!