The Samsung is barely faster than the WD. The only advantage would be if you clone to the Samsung and install Samsung Magician then enable RAPID mode. RAPID mode uses some of the system RAM for a cache and increases read and write speed. But remember that it is using some of your system RAM and if you have less than 16 GB of RAM (8 GB total for example) it may slightly affect other performance.
I have a M17 R4 I bought new back in Aug this year.  It came with a 1tb, PC SN730 NVMe WDC 1024GB.  I ran out of storage a lot faster than I thought so after reading this forum and others I bought the Samsung 970 EVO Plus NVMe M.2 SSD 2TB. My question, is it worth cloning the original drive onto the 970 and making the 970 my boot drive, or just put the 970 in slot 2 and use it as storage?  I researched some and it appears the 970 is a little faster than what I have.  If I clone the OS to the 970, do I need to install it in slot 1 as the boot drive? Any advice is appreciated, Thanks for your time 
m17 R4, adding second SSD (970 EVO Plus 2TB)