Suggestion Needed for Buying Portable HDD

I need to buy 250GB portable HDD and I've looked at Galaxy website.

WD 250GB Passport is for 7900/- and the other option is to buy Samsung 2.5" 250GB SATA 8MB, and put it in USB casing, which costs 5700/- + 450/- = 6150/-. I think the size for USB casing would be slightly thinner than passport, but not sure. And what about the performance? Anyone having samsung hdd experience?

Price difference is 1500+. Need suggestions. Thanks!

Dont buy the passport, the Samsung optioin is much better