OW thumbpad d/n have the N series’ s DPad “+” shape (does anyone use the horrible raised stick on the N series? Think everyone pulls it to use the DPad), so it does not as easily tell your thumb which direction you are pressing if you have low tactile sensitivity (as I do).

I suspect that the OW’s mechanical keys will not survive being forcibly slammed into the edge of a cabinet when players RAAAGE. I can verify that the N52/Nostromos membrane keys survive such (even tho a circuit board is still underneath) and being thrown HARD across rooms into solid objects. N series looks cheap, but is tough as nails.
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OW adjustable thumbpad STILL has not addressed reach issues for SMALLER hands. Stick can only be moved FURTHER away from the rest of the pad, not closer. Folks w/bigger hands were not complaining . .

OW is $50 more. .And goes clickety clack when used.Heard there is stealth version, but IDK how that holds up. C?N find if it costs same, either.

That said, w/respect to “do you need one?”, the N’s and OW both have on major advantage over keyboards: the thumbpad. using 1 “stick” for directionals instead of 2 fingers to hit directional buttons is both more efficient, and more intuitive. If you have massively good hand/eye coordination, you may think there is no difference,but most folks do find it much easier.