The main thing the IR nets you is the ability to engrave metals without any kind of marking spray or other coating.
Some transparent materials also work, I managed to engrave 12mm clear acrylic in the center.
Also combined the power of the blue diode and IR for combo-works. Did a black circle with the blue diode + TiO2, then used the IR to engrave the titanium away.
Note; these were done on my XTool D1 Pro with 2W IR laser. I assume the one from Snapmaker should have similar results.