Feeling:
ABS>PBT>POM
Antifraying:
POM>PBT>ABS
Plasticity
ABS>PBT>POM
Printing:
screen printing process<laser lithography stencil printing Two color printing dye-sub
as a matter of fact it's determine to you.If you often use your keyboard,like programmer, playing game. or writer blabla .PBT and POM must be your better choice. Besides, You should take the cost into your consideration. PBT.POM are much more expensive. dye-sub printing is expenive ,but it can make colorful keycap.Screen priting is much more worse than later, stencil ,two-color and dye-sub. besides screen. other printing are alright. If you really like keyboard . PBT plastic and dye-sub printing will be your best choice. But for me, The design is important too. Like the layout and color and the feeling.