I know people tend to get obsessed about the confirmation time, but the important factors are the number of nodes and the speed at which any given transaction is seen by the network as a whole.
I believe this is under three seconds for a transaction to be seen by the entire bitcoin network.
Why is this measure important? Because this is the so-called "window of opportunity" for a double-spend. In fact as soon as the transaction hits the network, the race is on, so we are actually talking about milliseconds.
Satoshi provided an answer to this somewhere (I can't find it right now) which explains what the real issue is.
A large number of nodes means that any double spend attack, has to work harder to get the transaction seen first, and hence included in a block first. But again this is totally arbitrary because nobody can predict the winner of the block (who gets to choose which transactions to include).
So this "fastest confirmation" metric is a red herring.