Mechanical keyboards are the best things, I don't want to go back to a rubber dome again.
I use a razer blackwidow ultimate 2016 which uses these razer green switches, they're kind of like mx browns which have that tactile click before you push the key all the way down and are clicky as all hell (which i love).
But if anything, there is one keyboard that stands above all, a keyboard that I've never had the pleasure of touching: The IBM Model M, AKA one of the greatest mechanical keyboards to grace the Earth.