Best budget portable Bluetooth speaker

Tetea Kawlvawm

Right off the assembly line
I need to buy an affordable portable Bluetooth speaker to be used at my office. I've shortlisted three - Logitech X 100, JBL Go and Zoook ZB-BS100. Kindly give me advise which one is best in term of sound quality; all other aspect/attributes are negligible. I am listening rock music most of the time.
 
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