Eset has a very good and praised antivirus in their NOD32,but I didn't see this antivirus in the "top 3" in any recent independent tests.
For some unknonwn reason to me , I have never seen a independent test for VA, seems like Sunbelt dosen't subscribe their antivirus engine to regular tests or dosen't see the benefits of independete testing.
I have seen the antivirus from Vipre at work in my personal tests and it performed very good but because this Antivirus hasn't yet been tested by a independent testing organization I will have to say that ESET won's in the "antivirus engine" category.
Like NOD32, Vipre Antivirus Home is light and you'll barely feel his presence on your pc.
I have used and loved "Vipre Antivirus Premium" and I must say that it has one of the best Web Guards on the market,but this is isn't about the Premium version so I'll show you what made "Vipre Antivirus" be my first choice when compared with NOD32