On reds vs. browns:
Reds win, GO CINCINNATI!
In all seriousness, the difference is barely noticeable. Tried them on the Switch Try Numpad. They... kind of feel lighter? Barely? I wouldn't notice if I didn't have browns right next to them. And as for linear vs. the subtle tactility of browns, again it just feels like browns that have been very worn down.
So yeah: want MX reds on the cheap? Get a heavily used MX brown keyboard.