I'm a Nod32 subscriber but currently Trialing Kaspersky, and out of the 2, preference, i personally prefer Kaspersky for its ease of use and layout, but i do personally believe it does drag on the system more then Nod32, albeit just a tad more.....
If it were upto me, i'd look at the 2 above, and just choose which is cheapest.
If it were upto me, i'd look at the 2 above, and just choose which is cheapest.