I first had the purple big stubbies, which werent from nylon, but i personally find the grip not as pleasant as from these ones! The purple ones are a bit too deep and dont feel too well, also i started having chips off the tip! By the nylon ones, the carving isnt too deep, and it feels like you have more grip, its strong and it barely bends.
Pros:
Strong
Better grip
Smooth
Doesnt chip
Cons:
(For some only ) feels a bit thinner than the purple ones
In short:
Really good plecs, maybe my favorite ones till now! Very good for solo work or a strong/full chord