I will recommend you to go for ADATA hd710. The purpose for which portable drives are used is to transfer data not for synthetic benchmark and Hd710 is fast in it . Also you will get a protective layer to prevent it from being get damaged in accidental drops. Rest choice is yours
Recently bought a 1tb seagate backup plus for myself considering the fact that it's the only drive manufacturer offering a portable hdd with modular sata to USB controller. Now I can even use my older 160gb spare hdd with seagate controller and can use portable storage on my goflex home dock.