Cherry MX Blue and Razer Green Gen 3 are clicky switches with click jacket designs, making a loud and signature clicky sound on the downstroke. The Razer's feel a bit smoother out of the box, and they have a clear housing that allows for better RGB illumination.
Cherry MX Brown switches are tactile and have a small bump to overcome during actuation. On the other hand, the Razer Green Gen 3 switches are clicky switches. They're noticeably heavier-feeling and loud, making a signature click sound on the downstroke. Both switches offer the same level of latency performance.
Cherry MX Red are linear switches that actuate smoothly throughout their entire keypress. On the other hand, Razer Green Gen 3 are heavier clicky switches with shorter pre-travel, but they're noticeably less smooth from the factory. Both switches offer similar latency performance.