The 970 Evo has V-NAND with 64 layers and the new 970 Evo plus has V-NAND with 96 layers. There is a 20-40% increase in performance for writing and IOPS. From 2'500 MB/s to 3'300 MB/s with Turbowrite, after the 42GB Turbowrite it is then 1'200MB/s with the Evo and 1'700MB/s with the Plus version with 1TB.
The surcharge is definitely worth it.

...is a little faster than the one without plus: https://www.digitec.ch/de...

I would also be very interested in the answer to this question ( Macbook Pro 15" 2018 & 2019) ?

I don't quite understand the m.2 ssd's...

question. does this m.2 ssd fit on an asus z170 gaming pro?

It's from 2019, One Plus is old model...

Will it fit in a MacBook Pro 15 inch Mid 2015?