If you've found this post then you've reached the stage of "what keycaps do I get" of the mechanical keyboard hobby.
PBT Keycaps vs. ABS Keycaps - Das Keyboard Mechanical Keyboard Blog
ABS vs. PBT Keycap Sets for Mechanical Keyboards - Glorious Gaming
Doubleshot vs. Dye Sublimation: Which 1 better? – Goblintechkeys
The Ars Technica guide to mechanical keyboards
PBT or ABS?
ABS vs. PBT Keycaps: Keycap Materials You Should Know – Keychron
Cheap PBT Keycaps – Reviewing A Low-budget PBT Keyset
ABS vs. PBT Keycaps: What Are the Differences?
The Best Keycap Profile ⎮ In-depth Analysis Comparing 18 Keycap Profiles