Which is best bluetooth Speaker

I need to buy one bluetooth speaker. Expert opinion required in this regard.

1. Soundbot SB510
2. Yamaha RX V681
3. ZVOX SB500
4. Soundbot SB360
5. Fugoo Sport
6. Fugoo Tough Portable

I didn't check these models by myself and wanna buy one of them through e-bay or any other online store.

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