Ambient Light
Ambient light is a HUGE factor limiting traditional projection setups. Often times, you have to have little to no ambient light in your event space in order to have your content able to be seen. This makes outdoor screens nearly impossible to use.
Longevity
The longevity of LED walls is also much longer than projection screens, with an average lifespan of over 100,000 hours! Depending on how often you use the wall, you could end up getting 10-15+ years of use.