Sram:

Developed specifically for SRAM 1X, X-ACTUATION keeps shifting sharp and consistent across the entire 10- to 42-tooth cassette and ZeroLoss, which simply means, well, zero loss when you push on the lever, for an upshift or down shift, the cable is engaged instantly zero loss of movement. There is no middle-ground where youre waiting for the shift to come. Gear changes are instant and precise.