Expensive ought to have the advantage, or what's the point?
You already have a big cargo hold, so you can also trade in the expensive ship.
You have much more firepower, which makes the expensive ship superior for bounty farming and Conflict zones.
And speaking of "advantages", isn't having more firepower also an advantage in PVP? No one asks equal treatment, but Pythons can still spam shield cells no problem due to their massive shield lasting long enough for those 5 seconds, while smaller ships need to be a lot more psychic about when to press that button.
So instead of having versatility, we now have this game down to like 2 ships that are viable for PVP.