Every ship is the best at what it does, or that ship shouldn't exist.
What are the things each ship is the best at?
Examples and my own entries:
TIE Bombers are the most survivable ship-class for their cost, are the cheapest bomb-platforms, and set the record for the variety of ordnance the can carry.
X-Wings have the best varieties of Pilot Abilities, and are the most resistant to meta-shifts.
&c&c&c&c