Plus, as we’ve seen in a few Rogue One previews, even though it hasn’t blown up any worlds yet, the Death Star will still be capable of causing mass destruction.
So much like how the uncompleted second Death Star gave the Rebels hell in Return of the Jedi, the nearly-completed Death Star in Rogue One will be a force to be reckoned with, making it all the more important that Jyn Erso and her compatriots find the schematics as soon as possible.
The Force Awakens introduced a new planetary-sized superweapon last year in Starkiller Base, which eliminated the Hosnian system.
Still, nothing beats the Death Stars, especially the first one.
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Rogue One: A Star Wars Story Ultimate Franchise Trailer (2016) - Felicity Jones Movie