this is a bit of a weird question mate, there's really no software that's "good for dnb". Fruity's plus points are it's easy of use and it's speed (and the price if you're the kinda fella that pays for things )
Fruity Loops is an abosolute must for a beginner or pro. It's easy to use & navigate & with the lateset addition you can import VST Plug-In straight to your tracks. Also use WASP it definetly add's the stinger!
I just got rid of Buzz for good. Its unprofessional sound was threatening to be a glass ceiling no matter how proficient my choonage was. I downloaded a Buzz-like tracker called "Psycle," but I might never touch it again for this reason:
I've been researching FL, even playing with the demo (which I turned into a full version, hehe - but I would happily pay for this if I had the means since it's reasonably priced). I like the interface and the ease of use, plus it can support Buzz Machines, so I can still play with my favourites.