The MP600 is recommended based on the good endurance, in the long run a very good thing but not so much for fast plotting. 2TB model won’t be able to use all its space for plotting. 2x1TB should be fine. In general 2x1TB in RAID0 seems to be a much safer bet in terms of speed.
Although I must say I’m getting a bit confused about the mp600, some people say it’s good, others say it’s horrible. In any case the sustained write speed is not so good, and everyone at least seems to agree that this is a bad thing for plotting.
I’m using 2x 1TB WD SN750 myself now. They do ok for speed, price is good, endurance…not so much 
I guess I’ll find out how long they last.
You could also have a look if you can maybe find the OEM model of the 980 pro at better price.
PM9A1 (I think)
Also good to read:
where storage_jm comments/rips on that video and gives some more insight into the inner workings of ssd’s