Wing Commander was 1990 with Chris Roberts as Lead Designer, published by Origin.
X-wing was 1993 with Lawrence Holland and Edward Kilham listed as designers, published by Lucasarts.
Tie Fighter was released in 1994 I believe with Lawrence Holland and Edward Kilham still as designers and still published by lucasarts, but with a much improved engine.
Wing Commander was a much earlier game so a lot of the innovations such as energy management in X-wing, Tie Fighter weren't conceieved of as yet.