muelltfz :
i edit videos ,encode and render 3d so it kinda matter. thanks for answering guys, need a better answer for my question though
And I do a LOT of photo work, CAD, host a couple of VM database servers for development work....
Your use case isn't
that special.
For your use case, I'd have no problem buying either of those drives.
All these drives are proving to have a lifespan far in excess of the number on the warranty. To the point of you'd have to write hundreds of GB per day, every single day, for years.
The primary thing you need to consider is that ALL drives die. EVO, NVMe, HDD, whatever. ALL of them, eventually.
In this case, 'eventually' will be a long time for either of those drives.
How to protect against that? A comprehensive backup plan.
If it dies within the warranty period, you get a new one, free. Recover your data from the backup.
If out of the warranty period...well, it had a good run.
"(256GB) the 850 pro has 150tbw and 960 evo has 100tbw"
http://www.samsung.com/semiconductor/minisite/ssd/support/warranty.html
The 850 Pro has a 10 year warranty. Highly doubtful you'll still be using this as a primary drive in 10 years, simply due to the size.
The 960 EVO only has a 3 year warranty.
Given that disparity, and if it worries you, get the 850 PRO.
(but it really doesn't matter)
(and create and implement a good backup plan)