Your question is a bit vague, as the furniture market is huge. Do you want basic furniture? Or do you want design one? How is your expenditure, budget-wise?
These are all factors that influence your buying. And also, it depends chiefly on what kind of buyer are you: a personal buyer (that is, for your house) or a professional one (for your shop).
I am pretty sure that my definition of best would be very different from your definition of best., especially since I work professionally in the field.
So, yours is a very open-ended question, with lots of answers possible.
I would say that, in professional terms, the best places to buy furniture are the big furniture fairs. The world is dotted by them, and they are open to the public as well - however the majority of the big ones accept just professional transactions: that is, you cannot buy direct, but some (generally the smaller companies) are also known, when the fair closes, to sell the objects they had on show instead of packing them and bringing them back to the company. So, if you are interested in making a quick and good deal, be sure to inquire directly at the booth.
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I prefer going to auctions when buying furniture for my room. You can find some really nice, classic things, even unique. If your after something new, check out your local furniture stores. Different stores have different thing that are nice so it's hard to choose the best. I have to visit them all before deciding as one shop might have a bed I like and another, a closet.
Stores can give you some great deals with payment plans etc, However I would also recommend Garage Sales, you can get great bargains there too as well as auctions like cookielove said