Counter-Strike versions - which one is the better one for tournament?

http://www.xleague.tv

Trying to do a bit of research on Counter-Strike and I've found
several different versions from GameFAQs:

Half-Life: Counter-Strike
Counter-Strike: Condition Zero
Counter-Strike 1.6
Counter-Strike: Source
Counter-Strike 1: Anthology
Counter-Strike XBOX

I assume Counter-Strike 1: Anthology is just Half-Life: Counter-Strike
repackaged with just Counter-Strike with extra maps, etc. and the XBox
version of Counter-Strike is a version that no one plays. Counter-
Strike: Source and 1.6 I hear are the more popular versions out of the
lot but what is Counter-Strike: Condition Zero? Is that version 1.6???

Also, out of Counter-Strike: Source and 1.6, which one is the better
version for tournament and league play? Bare in mind that this will be
televised, so my gut feeling is that Counter-Strike: Source will be
used since it has better graphics. I'm not too sure.

Let me know as I've got till the end of the month to sort this out.
Cheers!

.

Relevant Pages

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    ... I think CounterStrike Source is best, I just love the graphics (via ... Trying to do a bit of research on Counter-Strike and I've found ... Condition Zero? ... version for tournament and league play? ...
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