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I'm a bit confused, is it the 3 in the topic or the 2 you mention in the post that are interesting and you want to focus on?
In any case, I'd pick A2ZS retail. The OEM versions can have severe driver problems and iirc are not supported by Creative per se. The plain Audigy 1 is a 5.1 card the others are 7.1 so if amount of speakers is an issue do not pick that. The Audigy 4 non pro is possibly slightly better, with emphasis on slightly, than the 2ZS but the margin is very slim so go for the cheapest which I would guess is the A2ZS.
Then again... A4 is newer.
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