I don't know how much of a difference between the 2 technology.
Scissors typically goes on laptops because of their low profile and short travel. Known to last 5-10M cycles
MX Goes on standard keyboards and are rated 50M cycles. They come in many flavors (Clicky, Tactile non clicky or linear) with varios spring forces.
Expect to play at least twice the price of the two boards above. Choose your keyboard then buy a separate aluminum case for it.