I've built up a few bikes now and have noticed that the shifting and braking seems to be be more precise when I used cable kits with metal ferrules (SRAM) vs kits with plastic ferrules (Jagwire).
I can see how plastic ferrules could potentially be more friendly to cable, but metal seems superior in terms of lack of compression.
Is it just the ferrules or is there more going on here?
I've done 3 bikes with Jaguar kits and 2 with SRAM kits. Whenever cutting a housing, I make sure that the end is squared off before installing a ferrule.