Which drive to use in my Roamio Basic, Please?

I know this has been beat to death in the past. Sorry, just checking for anything new.

I'm trying to decide which drive to put in my Roamio Basic.

Please advise?



WD30EURS

http://ift.tt/1HxVy3J



Or



WD30EURX

http://ift.tt/1HxVy3S



Or Neither? What would you get?



Thanks!