And Hawker Hurricanes I believe
But yeah. X-Wing is a well proven ship. Plus, it seems very likely that Incom kept up with the 'fly a T-16, pretty much able to fly a T-65' ethos.
Ship may be more expensive, but they last longer and it's far cheaper to train your would-be pilots, as they already know what most of the knobs and buzzers do. Training boost leads to earlier Ace Pilots, general durability helps them stay Ace Pilots for longer.