My main browser on all my computers is Opera. I use it because it's fast, it's very safe and secure and it gives me everything I want without the need to hunt down and install a zillion add-ons.
It's easy to use, clean, has a lot of in-built features, the layout can be customised easily and I can get the effect I want in seconds. I love it and I would (and have/do) recommend it to anyone.
As for the most annoying browser that would be the Internet Exploder sorry Explorer we have these days. I very rarely use it and when I do it irks me so much I want to scream. The look and feel of it is is awful and it can't be customised to make it user friendly. It's slow and quite frankly I don't trust it to be secure.