OBD- II reader with bluetooth capability to link to my smart phone

I'm in a toss up between these two products.

• http://www.amazon.com/ScanTool-426101-OBDLink-Bluetooth-Interface/dp/B006NZTZLQ/ref=zg_bs_15707381_16
• http://www.amazon.com/PLX-Devices-Kiwi-Bluetooth-Wireless/dp/B004B0C1NE/ref=sr_1_1?s=automotive&ie=UTF8&qid=1399348477&sr=1-1

I like that the MX is a sleek compact unit.

But I've heard great reviews of the Kiwi, just not sure what I think about that cable for advanced instrumentation, not likely that I'd use it, and it wouldn't tuck out of the way as conveniently.