The Dragon kit is very nice, I built it once. The fit was pretty good, not sure about dimensions however, some parts "seemed" oversized. If your into scratchbuilding details and detailing in general the Dragon one is the way to go.
I have the Trumpeter in my stash....WOW for my skills,( which are mediocore at best),the kit has outstanding detail and WAY MORE parts than the Dragon. I have not built the Trumpeter so I can't comment on dimentions or fit.
Cybermodeler has reviews of both kits I think on thier website as well.