請問 A-DARA 威剛 SSD S592 與 S596 差別

最近搜尋了一下國外網站發現一個 C/P 值還不錯的SSD -> A-DARA S596,
S596 價錢比 S592 便宜許多, 只是國內似乎沒有 S596
逛了一下威剛網站
http://www.adata-group.com/TW/products_category.php?ProductType=SSD&TypeUse=SATAII
除了價錢(從其他網站比價得知)差異較大外, 效能上的規格皆大同小異

S592
Capacity: 32GB 64GB 128GB 256GB
Connector : 7+15 pin SATA II
Form Factor : 2.5"
Cache buffer : SDRAM
Flash Type : MLC
Performance:
Sequential Read up to 230 MB/sec
Sequential Write up to 170 MB/sec

32GB performance
Read : Up to 230MB/S
Write : Up to 150MB/S

64GB performance
Read : Up to 230MB/S
Write : Up to 150MB/S

128GB performance
Read : Up to 250MB/S
Write : Up to 170MB/S


S596
Connector :Dual interface 7+15 pin SATA II and MINI-USB***
Form Factor : 2.5"
Cache buffer : 128MB DDR2 SDRAM
Flash Type : MLC
Performance:***by ATTO

64GB performance
Read : Up to 240MB/S
Write : Up to 110MB/S

128GB performance
Read : Up to 250MB/S
Write : Up to 180MB/S

256GB performance
Read : Up to 240MB/S
Write : Up to 180MB/S

以 64GB 為例 S592 $199, S596 $165
綜觀上述條件是否想請問 S596 是否比較划算 ?