Definitely Samsung! Don't know how is the situation now, but in February this year they started to use the 20nm Micron chips instead of the 19nm Toshiba chips so the speed has become much slower (ssdnow v300)... (http://www.anandtech.com/show/7763/an-update-to-kingston-ssdnow-v300-a-switch-to-slower-micron-nand)
If you really don't want to spend more you can still go with the Samsung 840 EVO (just make sure that you have the last firmware)