My 97 has ABS, leather, and the optional 3.27s, so it's pretty well equiped.
Sometimes I like the ABS, but on plain dry pavement, I feel like it prevents good weight transfer and increases the stopping distance compared to using my right foot. Of course, in the snow and rain, I am glad to have it.
On 99+ stangs, I believe the TCS is attached to the ABS, so if you have one, you have both. They use the same sensors after all.