Asking which is the best browser is pointless, as people will reply with whatever happens to be their own favourite. Best for what? Faster? Most secure? Widest range of add-ons?
Browsers have no effect on SEO. Different browsers have different add-ons which may help with SEO tasks, but again, you need to try them for yourself and decide which suits you and your way of working.
You will find plenty of information in the Internet Marketing forums. I suggest you start by reading the sticky threads at the top of that forum.