I am in immediate need of more hard drive space as my Xbox One HD has less than 2 gigs remaining. I was just wondering which is a better choice? I have already decided to purchase a Western Digital(WD) hard drive and I'm thinking about a 3 TB storage capacity. Best Buy currently has great sales on these HDs, my only question is which type. I do realize the portability advantage of the portable HD but what are the pros and cons of each to warrant the better choice?