I use Vic Firth's Steve Smith Signature model, Vic Firth's Buddy Rich Signature Model. Out of the two, the Steve Smith Signature gets the nod when it comes to the quantity that's in my stick bag.
Regarding mallets, I have a pair of Mike Balter marimba mallets and Vic Firth's Becken mallets. I also have a pair of Vic Firth's Rutes (original size) as well as a pair of Pro-Mark's Hot Rods (original size).
Why do I use them? I use them because they feel good to my hands and they produce the desired tone and response on my cymbals and drums.