For Starships that is,
1. They require NO FUEL. They rely on sunlight, (which available everywhere in the galaxy from stars,.
2. You could carry a little fuel just in case, But you wouldn't need a lot.
3. You would have to have a small, low mass ship to get it up to speed faster.
4. However, if you decide to go the science fiction route you can really amp them up.
5. Solar sails look more exotic, more space age to me than rocket ships do. Rocket ships are born of necessity to get out of Earth's atmosphere. Solar sails are designed solar for their environment. So they seem very suited for science fiction space ships.
6. Sure, it may not be WW2 in space anymore, but I don't mind. Solar starships would look cooler than the rocket ones anyway, which have become cliche in fiction.