Probably also their ease of use (which goes along with training like Unknownsailor mentioned).
An odd example is how the instruments in Star Trek Bridge Crew (VR) work between different ships. The Enterprise D may be a beast but trying to work with the classic LCARS interface for helm and weapons can be absolutely confusing. The TOS Constitution class is... comically impossible to work with. Yet the spinoff, alternate timeline ship happens to be fairly workable.
Granted, this is a game, where the devs may or may not have taken some strange creative liberties with the design, but it's still a fairly decent example of how things can play out.
Probably also their ease of use (which goes along with training like Unknownsailor mentioned).
An odd example is how the instruments in Star Trek Bridge Crew (VR) work between different ships. The Enterprise D may be a beast but trying to work with the classic LCARS interface for helm and weapons can be absolutely confusing. The TOS Constitution class is... comically impossible to work with. Yet the spinoff, alternate timeline ship happens to be fairly workable.
Granted, this is a game, where the devs may or may not have taken some strange creative liberties with the design, but it's still a fairly decent example of how things can play out.