Ptheory
It's a question that's been done to death on this forum yet still attracts an awful lot of interest.
It always surprises me that the cake moderators don't move them to the "software" forum as they are generally not really sonar related but I'm glad they don't.
They are both great programs
My preference for BFD2 & Eco was ultimately the sound. Whether superior is less, or more processed is one thing but what affects the sound isn't just down to one being more processed than the other.
It's down to the studio/room and the equipment used to record the drums. The drum sound of BFD2 is big, very big and loud but very warm too.
The ethos behind both products is pretty much the same. That is to give you raw unprocessed recordings and all the tools that a drum engineer would have in a top studio.
BFD2 is big, it comes with 10 whole kits and weighs in a 50GB unless you get the download version which is smaller but not sure by how much.
The demo's you will find in the fxpansion site are ok but don't really do it justice. Although I will say they seem to cover a much wider variety of styles than the ones I head on the toontrack site.
Personally I prefer to hear drums on their own and that's one thing I really like about their site and is quite unique, but there is a
Kit Browser page where you can individually preview each kit piece.
A little over the top some may say but fxpansion pay great attention to detail.
Until the end of this month there is an irresistible deal on BFD Eco (BFD2's little brother) which you can get for $49 (normally $99) as if that's not enough it also comes with a free rock legends kit from platinum samples (normally $59)
BFD Eco is a seriously great drumpler in it's own right and may well be plenty for your requirements. I wont presume how much you do, or don't know about drum engineering but for me BFD2 was quite daunting as I clearly knew much less than I had thought. There some great tutorials and lots of help on the fx forum as well as here.
There is also a BFD2 demo you can download and try for as long as you like. It only comes with one kit, has less velocity layers and I believe less midi loops included but apart from that it is the full program.
You'll need to create an account before you can get the demo.
Hope that's helped
Steve