Well You Can Use Firefox,Google Chrome But...You Shouldn't Cause Firefox Is Realy Slow And You'll Fail alot But i Say You Should Use Google Chrome And IE
Google is a search engine and Google Chrome is a web browser( like internet explorer ). There is no point to compare them.
No you don't need a google account to have google chrome
Beta just means that it is a new version, still in testing. It may still have bugs and such.