Only the Dragon kit has figures, but both kits have good levels of detail. The Dragon kit has 700+ parts, the Trumpeter has 1100+.
Be advised the finished product is a monster. The Dragon will measure 43" in length when completed, I don't know the dimensions on the Trumpeter but it includes a turntable railroad section, so it's as least as big if not bigger.
The Dragon will be cheaper, but the Trumpeter delivers more individiual pieces and some of the finer detail.
Here's an excellent review of the two kits side by side. I opted for the Dragon due to price issues myself, but have yet to build it.
http://pmms.webace.com.au/reviews/vehicles/misc/k5.htm