As some others have said, there is no such thing like the best-ever-for-everyone key sets, either PBT or any other material. However, there are some factors that contribute to a good feeling of a set, the profile, the wall thickness and the texture. Contoured profiles like Cherry and OEM tend to feel better than flat ones like DSA; the wall thickness is one of the most important aspects to contribute to the final feeling, in general the thicker the better, in order BSP, some OEM sets, DSA, Taihao and similars; finally, the texture, the finer textures tend to feel better, but here anyone is different, BSP has a finer texture than some OEM and DSA.
That said, you should make your homework and try some of them by yourself, BSP has been regarded as one of the best PBT sets, but they are very expensive and scarce, but it rivals OG PBT Cherry sets and they came in dye sub legends that may outlast you.