I prefer the T type miter slots. If you have one you can use either a standard miter gauge or a T type. The T part of the slots was added to provide some hold down capability as the miter gauges and fixtures that are intended to mate with it have washer(s) inserted in the bottom of the bar that ride in the T, and prevent the jig or miter gauge from lifting during the cut. It's more of a safety addition than it is a woodworking requirement.
To determine the correct miter slot location your jigs, sleds, and miter guides must clear your largest cutter bit. I always place it a bit farther than this, so there is about 1" of clearance between my largest sled and my largest cutter. I use backer boards to prevent chip-out and these can be set for zero clearance to the bit anyway.