The Chuck's button is definitely easier to replace. NO DOUBT
as far as which lasts longer... not sure exactly, but I can say that there is more of a chance to break the chuck's button if you drop it
with that being said they are both good purchases depending on your wants and needs
This is assuming that you are asking because you are trying to decide which to purchase...if that is the case ..IMO
for good looks and unique quality build get the SB unless you have a custom print you want to sport and then that would make the chuck an excellent choice.
if your primary concern is ease of repair.. should that be needed one day, then that would be another plus for the chuck.