Didn't know about the Aftermath thing... actually pretty interesting. Some good discussion there.
GSG-9 is more military than police... and they ain't as concerned with taking people down as much as they are taking them out. Weapons wise, I think SWAT has an edge, just 'cause I'm hella biased towards American weapons. Depends what we're talking about. Are we saying GSG-9 vs SWAT in a killfest? Then yeah, maybe SWAT has an edge. But generally speaking, I'd think that SWAT would be more reserved in their tactics, thus making GSG-9 deadlier. *shrug*
And the stingball vs taser is bullshit. SWAT uses stingballs too... but it's flashbangs all the way. Stingballs risk too much collateral damage, and if you have a taser in your hand, you DON'T have your primary weapon in your hand. Non-issue.