Both keyboards have advantages and disadvantages, and which one you choose depends on your habits and preferences for specific functions.
If you prefer the shaft with a slight section feel and RGB backlight effect, and don't mind paying a little more for a higher quality PBT keycap, then the Fl980V2 Pro may be a better choice.
If you're on a budget or don't have a specific need for full-key no-hit functionality, the MK870 is also a good choice.