Question which PSU is better for my setup

[Azfar Siddiqui]

I need help deciding which PSU will be a better choice between Corsair RMx 750x and Corsair HX 750
My setup is
i9 9900K (will plan to OC in near future)
1070 GTX Gaming Z (OC'ed)
z390 Motherboard with 16 GB RAM

I want something that has longetivity and wont crap when OC'ing

 

[Ralston18]

Total up the wattage requirements for all components. If a wattage range is given use the high watt value.

Once totaled add 25%.

Then read the following link:

https://www.tomshardware.com/reviews/best-psus,4229.html

 

[King_V]

Both of those PSUs are excellent choices.