I have both of those and they are both great. The only thing I just dont find enough grooves for some of the music I do which is basically country. I just ordered drum core after listening to their demos. I ordered the Larry pack which features the drummer from Brooks and Dunn. I would check it out if you need more grooves. As far as sound goes you have great quality with what you have. BFd also sounded good but didnt have the kind of grooves I wanted
I have ezdrummer, Stylus RMX with every Expander and almost every Ilio program; DFH2, & BFD with many of their add on kits.
Stylus I like because I can get a vibe going quickly and when I play guitar this is great with BackBeat but ez drummer has the most beautiful acoustic sounding drums but I don't find it very well organised; just my opinion.
BFD needs the most amount of work to get it to sit right in a mix but it can also be used quickly but does not sound as good acoutically as ezdrummer imho. But it is still a useful and decent tool.
Overall, I easily use Stylus most of all because its breadth of vibes with all the expanders is second to none and for film scoring and soundscape work it is a crucial tool. It's multi's are phenomenal and a never ending source of inspiration which can be chopped around using the chaos menu producing many different weird and wonderful sounds.
They have a bundle deal where you can get dk+ drums, modelonia and another synth for less than $80
DK+ is pretty darn good and can be used in conjunction with Stylus RMX
Another one to look at is Jamstix. It's amazing really and feels like a real live drummer - have that play with a stylus groove and you get stylus' amazing sound and feel, and also the playability of a real drummer. Pretty cool stuff.
There's also Guru - which is supposed to kick butt!