I'm also looking for an external drive (preferably under $50).
Looked into upgrading the internal drive but that looks like a headache (advantage PS4).
I personally recommend the Seagate external powered drives... I bought the 6TB when it came out & I've never had a problem.
Also, on the off chance something does go wrong, they are generally very helpful and reputable company.
I am thinking of also getting one SSD for my Xbox one S. However I am debating between hdd cheaper alternative to SSD for performance? I would like anyone if hdd works just fine? Thanks in advance??