At this point I think just pick the size and connection type drive you want then just close your eyes and grab a drive off the shelf on sale.
I completely agree with this.
I would look more closely at the file system you wish to use.
Ive never had much joy with exFAT - yes its great due to cross compatibility between operating systems etc, but its also more susceptible to corruption. Ive never had data go corrupt on any external drive before - whether its FAT, FAT32, NTFS, HFS, etc - but its happened on every exFAT drive I have used - needless to say I no longer use exFAT, just don't trust it any more.....
If you have movies on Mac only format can you watch them on Windows too or not?