Weapons? I will have the Death Star, thank you.
Alright but in all seriousness and despite the Death Star making everything else look like a bunch of sticks and rocks, I would go for a katana and kodachi, alternatively another katana, mostly because I used to train Kenjutsu in the Niten Ichi Ryu style and have a soft spot for them, especially dual wielding, which is the main thing about the style.
it can be argued that the Death Star is a space station, rather than a weapon. Though of course it is well-armed. Hence why I went small with a mecha superweapon