There are 3 drives in this space :
Samsung Evo 1tb
OWC 960GB Mercury Electra
Crucial M500 960GB
The Samsung is the fastest of the 3, Samsung also have the lowest failure rates of the three. The Samsung Evo is also the cheapest.
Anandtech said :
"With the EVO, Samsung puts forth a formidable competitor to the M500. It's faster, uses less power at idle and carries lower MSRPs"
At the moment the Samsung Evo is king for 1tb drives. I follow SSD development very closely and for this Anandtech is the bible. Anand Lal Shimpi is taken so seriously as a reviewer of SSDs that manufacturers have modified their drives and firmware based on his recommendations.
http://www.anandtech.com/show/7173/...iew-120gb-250gb-500gb-750gb-1tb-models-tested
Also as a side note as someone else mentioned TLC nand as used in the Samsung Evo was thought to be less reliable. However Samsung have really made this a non issue. When Anandtech tested the Evo they showed a 1TB Evo would last at least 63 years at 50GB a day (every single day) of writes, (which is 31 years at 100GB per day ). Anandtech note that this is very conservative and real lifespan is likely double these figures.
"Keep in mind that all of this is based on 1129 p/e cycles, which is likely less than half of what the practical p/e cycle limit on Samsung's 19nm TLC NAND. To go ahead and double those numbers and then you're probably looking at reality. Endurance isn't a concern for client systems using the 840 EVO." Anandtech