The Samsung and Seagates are actually the same drive just with different branding.
I've personally had 3 Spinpoint F3s die on my within a year, which kind of puts me off Seagate/Samsung.
Recently though, I've been using 2.5 inch drive as I find them quieter, and easier to mount than 3.5 inch drives if you have to put one behind a motherboard tray or at the side of the optical bays or similar.