The Active 2 is older and has lower specs but the screen is brighter, 500 nits vs 400 nits for the RT3.
For comparison, I use a 6,3 inch Galaxy Note 8 with a beautiful 3K QHD+ (2960×1440 pixels) and 1200 nits bright AMOLED screen. Only wish it had a 16:9 screen aspect ratio.
