I want to get an OBDII adapter to use with Torque Pro. I'm interested in being able to monitor various data, and have a good tool to use if I need to read any CEL codes.

Here's one:
http://m.ebay.com/itm/111177868910?nav=SEARCH

And another:
http://www.amazon.com/BAFX-Products-Bluetooth-diagnostics-Android/dp/B005NLQAHS/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=2ML17QO1PJMG F&coliid=I3UQH4IOP3KQFG

Do you see any major differences, drawbacks in quality or function between the two? Which would you buy?

I plan to use it with Torque Pro on either my Android phone or tablet via BT.

 

Most of these cheap adapters are the same. They usually work fine for occasional use but intermittent Bluetooth connectivity issues get annoying when you try to use them every day. I would recommend something like a OBDlink mx or lx. Also the ones you linked to are a bit long to leave hanging from the connector. The short blue transparent ones fit better.

 

I have on of these here it works fine day to day, It is smaller than the others and I leave it in full time