Lol. I didn't think that those things would even run in grass. That is surprising.
Hers is geared to run a bit slower than stock, and runs the same diff as the ProSC10 and SR10, and i think thats why it runs so easy in grass, but, the DR10 is basically a ProSC10 with SR10 parts, and drag wheels and tires, which helps, whereas, the drag Slash is bashed off the Slash, but built more for drag racing, with dedicated parts just for drag racing (locked diff for example, whereas the DR10 is an open diff), and less for off road and bashing use.
I have a LCG 4x4 slash for offroad, just wanted to get something for asphalt duty. The leaning thing sounds attractive, I don't need it to perform but look cool as it drives around.
Given that you want something for asphalt use, a DR10 would be the better option. The drag Slash doesn't work near as well for that, without a bunch of changes, especially to the rear diff. Because it has a locked diff, it doesn't like to turn much at all, and is geared more for straight line use. To run a DR10 the way you want, all you might need to do is swap to a smaller pinion, and even that might not be necessary. I've had a drag Slash, a Losi 22S drag car, and currently have 3 AE DR10's, and, of the 3, hands down, for general bashing and goofing off, the DR10 is definitely more suited to it out of the box. Disclaimer: We built the first DR10 starting with a slider chassis from eBay, and, she liked it so much, we recently bought a new one during a trip to one of the LHS we sometimes go to, just to see if there were any differences between the one we built, and an out of the box stock one. There really isnt. The third one is another eBay slider for a project I'm working on.