I always have both a sled and mitre gauge/fence for use with a table, or cabinet saw, and router table.
As said, both have their uses and make what can be a tricky task, very easy.
The only time you probably wouldn’t need either, is if you own a CS-50, CS-70 or Mafell Erika, or any other push/pull saw. Even with those, a sliding table is a welcome addition.