ok, first of all don't use pin 1... leave pin 0 and 1 alone.
secondly, the transistor you need is based on how much current your application requires, 1 20ma LED only needs 20ma of current, so a transistor rated 200ma will handle 20ma, a transistor rated for 5amps will handle a 20ma LED.
if you have 3amp LED, you can't use a 200ma rated transistor...
The one you decide has to fit the current requirements, if you had loads of money, sure go ahead you can spend $5 a transistor to drive just 1 LED, it's up to you to decide which transistor you need for the job.
It only becomes tricky when you start to get get into frequencies and capacitance, mainly for radio projects, but for every day use, pretty much any transistor npn or pnp will do the job for LED's.