Maybe I misunderstood something.. but are you seriously considering, whether you should get a 24-year old bike, or a new bike?? If yes, they are going to be two totally different experiences, and of course the investment is very different, too.
The upside of the old one would be, that its naturally a lot cheaper, and its price does not really go down any more. But itīll be an old bike, make no mistake about that. Even a Transalp can break down, nothing lasts forever, or at the very least itīs highly probable, that a bike at that age will require some minor fixing from time to time.