The latter design is closer to existing Imperial designs...
I don't necessarily see that as a plus. The Rebels get variety in their ships, so why does every single Imperial starfighter have to be a ball with solar panels attached, while every capital ship's a flying slice of pizza? If both sides did it, then maybe I'd buy the whole, "ships on the same side should look similar," argument, but as it is, it just doesn't make sense.
Look at nations with significant navies, sovereign ship design and build capacity ( like the imps). Their ships and fleets are distinct, you always know a Royal Navy ship or an American naval ship will have specific characteristics required by their navies. This is because they have specific cultures and requirements around ship design needs and get bespoke designed ships just for them ( within cost limits ). Most less well funded navies ( or from poorer nations) have a mixed bag of off the shelf and second hand ships from different nations and design pedigrees ( just like the rebels).
