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.
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.