What makes it the best then.
Also, I didn't see the alternate currencies subforum until after I posted this, can it be moved there?
It's the best because this is bitcointalk. On ixcointalk, IxCoin would be the best. Etc.
More seriously, Bitcoin has the first-mover advantage, and I haven't seen any killer features on any of the other block chains that make them interesting to me. NameCoin is a somewhat interesting, but has highly specific functionality that I don't care about. The other blockchains just seem (to me) to be minor tweaks so that people can cash in, without providing any novel new benefits.