What is the best bluetooth to use?

I see that there is a few different models of bluetooth to choose from for a proffie. I am left scratching my head about which one is the best choice and which one will just work.

Bt909 is what I use. Works great.

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BT-909 “best”.
BT-630 works too. smaller.

What the difference between best and works too?

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Range and size. 909 better range. 603 smaller size

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awesome thanks