Disclaimer: I use blanks only, so I only compare the materials, not the printing methods.
1. Dense (so the caps are heavier than other material caps)
2. Sound better when bottoming out (more "thocky" than other materials)
3. Fast to type on (the "slipperiness" somehow helps).
Feels the best to me of all the keycaps materials I have tried (ABS, PBT, POM).
4. Makes the keyboard feel like a high quality supercar