There are tons of SSD in the Market and it is hard to choose which SSD is good for you. There are hundred of SSD in market and it is very difficult to choose the. But there is some unique hidden information in SSD that can easily find out.
Every body know the the Dram and speed of SSD and many people think this is the main focus but there are other thing that is also important and that is TBW and MTBF . TBW means terabyte written and MTBF mean Mean time between failures. after how many hours will take to die. normally it is rated that 1 million hours but we all know that there is no accurate time line so 2 million rated or 1.5 million rated SSD is trusted if you find out that SSD has no information written then try to avoid it if it is not well known brand. TBW means how many terabyte it can be written. it has range for each capacity. 1TB has 600 TBW ,500GB has 256 TBW 256 GB has 120TBW.
So if you do heavy work flow then 1TB is recommend. if you only casual gaming and has tight budget then go for 500 GB and if You only use for OS and use many application. You can get 128GB SSD if you like but only if you use your PC for browsering only.