Hi ReVaN,
Nod32 is the product of choice for power users, + fast, low resource usage, - high maintenance cost (yearly).
I know once that NOD32 used a reduced database concentrating on "in the wild" viruses instead of a fully historical one. They depend on a heuristic engine for way-back and bleeding-edge issues. So the WebScanner of Avast will be surely missed.
And here it is like comparing apples and pears. AV product has the VB 100. Had difficulty finding crippled "Zoo" viruses. So it is true that NOD32 is more than hype only, and "it did not fail to catch the worm" as any "good ÄV-bird" should. Some governments see Nod32 as their product of choice (e.g. Uruguay).
greets,
polonus