When comparing Environmental Visual Enhancements vs Kerbal Engineer Redux, the Slant community recommends Kerbal Engineer Redux for most people. In the question“What are the best Kerbal Space Program mods?” Kerbal Engineer Redux is ranked 1st while Environmental Visual Enhancements is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Prettifies the game
Adds city lights for Kerbin and adds clouds and better atmospheres to planets.
Pro Allows choosing only the wanted enhancements and skipping others
All unwanted plugins can be deleted from:
GameData/EnvironmentalVisualEnhancements/Plugins
Pro Helps with designing functional and efficient ships
Pro Shows important statistics when building crafts and in-flight
Shows important statistics when building crafts (mass, deltaV, thrust, ISP - while on Kerbin, in vacuum, or on other atmospheric bodies) and in-flight (all of the above + periapsis, apoapsis, orbital period, time to ap, time to pe and many many more).
Pro Provides customizable in-flight readouts of flight data
Pro This is not an autopilot
As opposed to MechJeb, which is considered "cheats". KER helps a ton by providing already available info in a very accessible manner.
Cons
Con 8K textures don't work on Macs
Macs need to use low resolution textures.
Con Less readable than some alternatives
The same information is presented in a more intuitive and readable way by DMagic's "Basic Delta V" and "Basic Orbit".