First, there are magnitudes more computing power behind Bitcoin, which makes Bitcoin far, far more secure than any other cryptocurrency.

Second, even if the premises of that post is true and 2.5-minute confirmations are more secure than 10-minute ones, it would be much easier to change Bitcoin to 2.5-minute blocks (which is a relatively trivial change as long as the majority of miners agree) than to switch to Litecoin losing tens (probably hundreds) of million dollars invested into the Bitcoin network security.