I do have experience with both. NPKC are considerably thicker, and I haven't had in QC issues with them. I have however had multiple issues with Tai-hao. One Miami set I ordered had a considerably warped left shift, and a considerably warped 0 key on the numpad.
An ABS Dolch set I ordered had absolutely no ribbing/reinforcement in the space bar, unlike the 3 other Tai-Hao sets I have. This caused it to flex considerably, and I ended up just leaving them in a drawer instead of putting them on a keyboard.
The only thing Tai-Hao does better is the fact that they're double shot. Otherwise NPKC is better in all respects.