Looking at these 3 SSD's. Ignoring pricing between them as they are all about the same (500gb versions) which offers the better performance? I'm leaning towards the M.2 form as I could just hook it up to my MOBO without having to worry about cables ever again.
http://www.amazon.com/Samsung-2-5-Inch-Internal-MZ-75E500B-AM/dp/B00OBRE5UE/ref=pd_cp_147_4?ie=UTF8&refRID=0RZVK0XKSBENKFPK53J7
http://www.amazon.com/dp/B00RQA6E20/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=AXB30I5KSD30&coliid=IZAZK9BSU924C&psc=1
http://www.amazon.com/Samsung-850-EVO-3-5-Inch-MZ-N5E500BW/dp/B00TGIW1XG/ref=sr_1_2?s=pc&ie=UTF8&qid=1452152538&sr=1-2&keywords=500gb+ssd+m.2
http://www.amazon.com/Samsung-2-5-Inch-Internal-MZ-75E500B-AM/dp/B00OBRE5UE/ref=pd_cp_147_4?ie=UTF8&refRID=0RZVK0XKSBENKFPK53J7
http://www.amazon.com/dp/B00RQA6E20/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=AXB30I5KSD30&coliid=IZAZK9BSU924C&psc=1
http://www.amazon.com/Samsung-850-EVO-3-5-Inch-MZ-N5E500BW/dp/B00TGIW1XG/ref=sr_1_2?s=pc&ie=UTF8&qid=1452152538&sr=1-2&keywords=500gb+ssd+m.2