I tried to quantify why I like thin ABS more than PBT, so I did a few typing test. In short, it is that I type ~10% faster on thin ABS caps with MX blues. The difference is negligible on browns and reds, but I do type slower on them to begin with. I get almost 110 average vs just under 100wpm (shush, I know these speeds are nothing to write home about, especially here amongst keyboard nerds.). May be it is all in my mind, but PBT felt heavier to press. I make significantly less transposition errors on 2-3 alternating hand letter combos with ABS for some reason. May be it's due to the more distinct tactile feedback. The average above is best effort, not including when I had to fix those stupid errors. If including, the difference would be much larger. I am sure I could eventually get used to the feel of PBT, but why bother? I already type faster with less effort. YMMV of course, though I am interested to see if anyone else type at different speeds between the different keycap material.