A brake disc’s face type (slot / groove pattern) is one of those changes and can influence many braking characteristics.
Some of them are:
Initial response (bite)
Control and modulation
Release
Pad wear
Disc wear.
There are also many variables which are considered when engineering a brake disc face type. Changing some of these variables can drastically influence the overall performance of the brake disc. Some (of the many) variables which are taken into consideration for brake disc slot design are:
Slot depth
Slot angle
Length of slot
Number of slots