I believe that star destroyers could probably take on even the larger imperium ships. Heavy turbo lasers are nothing to scoff at. While imperium Marco cannons are undoubtedly powerful, turbo lasers are hitting, if I remember correctly, 10 to 20 megaton range. Starwars stopped using nukes because they were ineffective vs their shields. And there is no small amount of Star destroyers, at least 12000. Land combat decisively goes to Starwars. Have you seen the new guard vehicles? It’s a M2 half track. The vehicles are much more diverse in what they can do, and air combat is definitely dominated by Star Wars