I own the Quiet Pro (typing on it right now actually) and have briefly tried my friend's MX Red Silent. There are a few things to consider:
1. Do you like tactile or linear, Quiet ALPS is tactile and MX Red Silent is linear.
2. Do you plan to do any form of customization in the future? If yes then go with Cherry, much easier to find parts.
3. Do you prefer "regular layout" for muscle memory, for me I prefer regular layout any special layout bugs me, for example the Matias Mini Quiet Pro have their own layout so which will throw me off. In that case I'd recommend the Filco.
4. Neither are truely "quiet", at best it's about same volume as rubber dome keyboard (still a little bit louder actually).
5. This is just personal preference, best "quiet" keyboard I like is Silent Topre, none silent is about same volume as the other 2 you listed.
Loudness From Quiet to Loudest:Scissor Switch (Laptop Keyboard)
Topre Silent
Chiclet Keyboard (Apple Keyboard)
Rubber Dome (Regular Keyboard)
MX Red Silent (Filco)
Quiet ALPS (Quiet Pro)
Topre
MX Red
MX Brown
MX Blue
Clicky ALPS
Buckling Spring
Typewriter
I guess it depends on you value more? If you want customization I say go with MX Red Silent. If you type a lot tactile switch might be better (Quiet Pro). Personally my favourite quiet switch is Topre so I'd even suggest Type Heaven if you don't want to spend a lot. If you game a lot linear is better then in that case go with MX Red Silent.
Read over the pros and cons and let me know what you think.
EDIT: I just re-read your thing and realize this is for MOBA, in that case DON'T get Topre which is horrible for gaming (slower rebound time). To be honest all things considered I'd probably lean slightly on Filco due to future compatibility and also Filco is like "the bar" for mechanical keyboards, it's a little bit future proof.