Have you ever had someone ask you what browser you use
Yes, plenty of times, and I tell them I use more than one browser, Firefox, Internet Explorer 9 and Opera 11 mainly
...or which one would be best for them? If so...what do you tell them?
. If they ask me which one would be best for them, I tell them that I can't decide that for them, that there is not really a lot of difference between the mainstream browsers, and that they should try them all out personally and see which they like best.
Do you tell them what you use and then swear by it...
No, definitely not.
or, do you suggest they do research and make their own informed decision?
I suggest they try out a number of browsers. Reading a website that says "Chrome is great!" is not "research". That site claims to "aggregate" other reviews but nowhere is there any evidence of this. They could have just written it all themselves, and knowing what I do about the founder, I know what I prefer to do.