I have the Duopar (non-titanium). Came on the '82 Trek 715 I just got but I'm not familiar with it and would rather have the one I'm used to. The Duopar is supposed to be a great touring derailleur and this one looks / functions well, but I like Suntour.
Or...should I keep the Duopar? Any thoughts appreciated. The Trek was originally supplied with either.