Until last month I would have said ESET Smart Security , I have 2 years licence left.
A Win8 update broke ESET making windows have a 4-5 minute delay when booting, I opened a ticket with ESET and didn't get a reply for 2 weeks, when they finally replied with a fix it didn't work & I didn't get another reply for 2 weeks, so told them to stick it [¬_¬]
I had to use NOD32 for the month and can say it works very well, I stopped using NOD32 years ago when it had CPU usage problems, but will stick with it now.
Every time I pay for software I seem to have problems and get no support, if I download a paid App for free it always seems to work.