I have MX reds and they play really nicely, its a huge upgrade from cheap keyboards and shitty key switches. A lot of top players use MX reds, i think. It would be best to try them out first and find what you are comfortable with though.
I've played with Razer Greens and Cherry MX Reds so far and I do like the reds better, mostly because they are linear and thus without a tactile bump, also the actuation point is a little lower than on the greens as far as I know.
I've only ever used red switches. I really don't like them all too much tbh. It was very hard to get used to typing without fat-fingering. I really like the clickiness sound of blues, but I'd probably get annoyed after a while. I might get browns soon.
I like typing letters so i got a blue outemu switches, it feels really nice to type on and has the same clicking noise just like the cherry mx blues. I don't really recommend for gaming because of it's activation point (or whatever its called). But for me, I enjoyed gaming with it.
As a fairly decent mania player, I have to admit that I kinda took the high-route and bought a little tool on Etsy that has enabled me to have pretty much nearly every Cherry switch on the tool, except for Cherry MX Super Blacks, but my personal favorite is the Cherry MX Silvers, they just feel really nice, below that is browns.
Even if the morrow is barren of promises nothing shall forestall my return...