Guess I wasn’t fast enough (being abroad can do that to you :-)).
If you can, always go with USB 3.0. Speed is everything. If you need less than 256GB of space (as many do), I would personally invest in getting a USB 3.0 external 2.5″ case and a 256GB SSD. Since there are no rotating parts, they odds of it getting damaged while playing are practically zero. Which in a public environment you might find yourself in is a big plus for me. And you don’t need a shockproof case (although it DOES help with stuff falling off the DJ stand).
Other than that, there are only two hard disk manufacturers left in the world I think, so either way you get good stuff. The difference between brands is often design, electronics (as in interface) and build quality.
Good luck with the Adata.
Greetinx,
Chuck