TBH, if you’re looking for “an external drive” rather than some sort of NAS solution, they’re much of a muchness these days. If I were getting one, I’d be looking for the best storage-to-price ratio that wasn’t made out of cheese. Though if your MBP supports USB3, that’s probably worth paying a small premium for.
Randomly, this fits the bill and is competitively priced. Though for £100 you could net a 3Tb unit.
either 2Tb on RAID 0 or 1TB on RAID 1
You’d almost certainly be better off with JBOD than RAID0. RAID0 is all the benefits of ‘just disks’ but with double the chance of failure. Friends don’t let friends use RAID0.