Which is truly better?

I'm replacing my HDD tommorow, and have to make a decision on what's really better. I've been using Norton for the last two years, but I don't know how it is in comparison to McAfee.

I know McAfee used to cause bugs and glitches back in the day on WinME, so how is it with WinXP?

Does it catch/deal with more viruses than Norton?

Any detailed info would be appreciated.

Thanks.