There are following factors you should keep in mind while choosing led displays:
1.What kind of content you need, only letters & numbers or pictures & videos? There are single color/ dual color/ full-color displays for choice.
2.What is the minimum viewing distance you require? Different type displays can be used for different viewing distance.
3.An important factor to consider is where you want to place the screen. For indoor purposes, you do not need the brightness or protection of an outdoor display screen. You would need higher resolution of the screen because the viewing distance would be closer than in outdoor spaces.
4.The highest and lowest temperature of the installation place, to decide if we need cooling system and heating system.
5.The distance between display to the control computer, to decide if you need fiber and fiber converter.
The explanation of Ingress Protection (e.g.IP65)
How to evaluate LED displays?