There have been some mention of being able to dye your armor, but in terms of stats, and whats better than another, you'll have to wait to hear more details. I can quote you from aionfuse about the stygma system though.
"Q: Could you explain the Stygma system? It seems to be an item combination system of some sort.
A: It's too early to reveal entirely but it's similar to the Materia system in FF7. Using a stygma you can use another player's skill as your own. For example if you find a rune or a book with the skill you can socket your weapon or armor with it."
[Interview] Post-mortem: Korean FF Test - AionFuse Forums
But if I had to guess, it'll be similar to lineage 2, with linear armor upgrades.