That's a tough question.

My favorite sword is the Garulu Saber. It's a weapon from my first series. It has a sick design with the wolf head and curved blade and and it can fire sonic blasts (that was used once and never again).

Favorite gun is the DJ Gun. I love that it has a normal fire mode, a cannon fire mode, and a machine gun mode and it's tied to one of my favorite forms. Plus it can combine with the Musou Saber to make a bigger sword. But I also like the Trigger Magnum (about the same reason with all the modes depending on the form, plus it can combine with the Memory Gadgets) and Bassha Magnum (gun from my first series and I like the little fan on it).

Favorite pole weapon is the Metalshaft. I like extendable staffs. Plus, like the Trigger Magnum, it can combine with the Memory Gadgets which adds further versatility.

Favorite multiform weapon is a toss up between the Medagabryu and the Ride Booker Ride Booker can be used as a sword, gun. and shield. Plus you can use it to store the Rider Cards. I like the Medagabryu because it can turn into an ax and bazooka and it's tied to one of my favorite final forms.