So this is a programmer keycap set, with lots of options related to the key cap profile.
Cherry is one of the most common, and close to OEM which is what most mass market keyboards use. XDA is a lower profile key cap with rounded edges. SA is a very dramatic profile and reduces travel distance to upper row keys and looks more like 60s/70s terminals. MOA is kinda cool as its a square cap that lofts to a round top.