Need suggestion on 1 TB 2.5 inch Portable Drive

Hi,
Among the below three please suggest one.

Below are the letsbuy prices :-
Seagate External Expansion 1TB (2.5 Inch) --> Rs 4300 (Yesterday it was 4999)
WD Elements SE 1TB (USB 3.0) Hard Drive --> Rs 4500 (Yesterday it was 4700)
Toshiba Canvio Basics 1TB (2.5 Inch) --> Rs 4549

Which one should I go for ?
Is Toshiba the thinnest among the three ?
Warranty wise which is good?
What is the warranty period of Seagate ?

Please give me your suggestions . I want to buy one of these before it goes 'out of stock'.