Hello and welcome My vote goes to Bitdefender internet security. But as long as you watch your browsing habits and don't download applications from unknown sources you should be good to go with either one.
I voted for Avast, as for me (and not only) since a few versions back Bitdefender is very buggy and unstable. Sometimes starts good and then bugs and problems appear. It's engine is good though and fortunately better programmers include it in their much less buggier and stable products.[/align]
My vote will definitely go for bitdefender,but it's really buggy ,avast on the otherhand provide protection with no performance impact and have all features that a good internet security suite should have.avast is also reported to have some minor bugs but nothing series though