Cherry MX Red and Kailh Box Red V2 are similar linear switches that actuate smoothly through the entire keypress. The Kailh switches are a bit more stable owing to their dust-proof stem design. They're also pre-lubed from the factory and noticeably smoother-feeling out of the box.
Gateron G Pro Red and Kailh Box Red V2 are linear switches with smooth actuation throughout the entire length of travel. Both switches come pre-lubed from the factory and have excellent smoothness out of the box. The Kailh switches are a bit more stable due to their dust-proof stem with perimeter design.