As with blades I do not believe that there is an objective "best" here. I just LOVE silver tip badger, because of its silky feel. Thanks to this board, I have learned that is doesn't need to be overly expensive. Whipped Dog is my favorite source for high quality, low-priced silver tips.
It's better to have both (BOAR & SILVER TIP) IMHO. And kudos to Sara, Whipped Dog is my fav source too. For both!