This is a question that can only be answered after an understanding of what you need, is met.
No matter what, get away from Internet explorer. Its absolute trash, and has nothing good worth mentioning.
Google is quick and simple, and has great features for most everyday users, as well as decent security. I always recommend it.
Firefox has the most features and security, but is geared for users who know how to take advantage of the features. I always use google, but switch to FF for web work.
Now if your just a facebook user or something, try flock. Its kinda cool, and based off FF.