I'm shifting from a 27" 3tb Fusion iMac (late 2013) to a late 2015 27" 5k with a 512Gb SSD.
Principle use is photo editing using Adobe Creative Cloud apps, mainly Lightroom.
The current Lightroom catalogue is about 850Gb so won't be able to live on the SSD and will have to be moved to an external drive (a copy of it lives on the NAS but as a working file location that probably is not fastest)
Externally I have available
1) Seagate NAS
2) WD My Passport Pro Thunderbolt portable RAID drive (2Tb in RAID)
3) 2Tb Thunderbolt Lacie rugged drive
4) 1.5Tb Iosafe HDD USB 3
5) 2Tb OWC Mercury Elite HDD USB 3
I think the fastest solution would be a Thunderbolt SSD, however I would need a second mortgage to get one of those and the largest size is still 1Tb I think.
Next fastest is probably the WD Passport Pro Thunderbolt but I do not know if it is designed to work in a 12 hour day environment - it would not be working all that time but powered up.
Next would be the Lacie due to the Thunderbolt connection but again perhaps not intended for this kind of use.
After that I think most of the drives are around the same transfer speeds.
I'd be grateful for recommendations (a) how best to use what I have and (b) what if any alternatives are worth considering.
(In case it helps, my image files are large RAW files from 36Mp cameras)