Snivy isn't the best of the starters, but it's arguably the most balanced. It was an integral part of my team in my first play-through of Pokemon Black. I also found a shiny Snivy on the online trade system and evolved it into a Serperior! It's a beautiful shiny Pokemon, too!
I also enjoy collecting the various trading cards of Snivy. I had many copies of the league promo version of Snivy, as well as a few other promo cards. As with any Pokemon that I collect (Raichu, Misdreavus/Mismagius, and Snivy). I'd collect multiple copies of each version of card, as long as they are holographic or reverse foil. I only collected single copies of "normal" cards unless they are not from a regular set (like Black and White, etc.) I just really like Snivy cards. They just look cool to me.
Which is your favorite Black and White starter?
Photo credit: bulbapedia.bulbagarden.net/wiki/Snivy