While a lot of people may prefer Tepig and Oshawott to Snivy to start Pokemon Black and White and its sequels, I've always liked Snivy. I think the design just really caught my eye when I first saw it spoiled. I just really like Snivy as a Pokemon. It's not 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 (which I love the look of!)
I also enjoy collected the various trading cards of Snivy. I have many copies of the league promo version of Snivy, as well as a few of the promos. As with any Pokemon that I collect (Raichu, Misdreavus/Mismagius, and Snivy) I collect multiple copies of each version of card, as long as they are holographic or reverse foil. I only collect 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.
What is your favorite Black and White starter?
Photo credit: bulbapedia.bulbagarden.net/wiki/Snivy