Arctic Silver 2 is old stuff.... you do realize they came out with Arctic Silver 3 and then 5 (dunno why they skipped 4).
Since the Zalman paste is a fairly new product compared to AS2, I'd go with the Zalman. I still prefer AS5 over anything else.... well except ceramique if I have any worries about conductivity.
If the Zalman heatsink came with the white paste, then the AS2 will probably be better. Zalman started including their new high-end paste with their heatsinks, but I'm not sure if yours came with it. If you got a bottle which says STG-1 on it then use that.
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