what section id is best for finding rare stuff

[Raden]

specifically rare weapons like swords sabers and blades

[Butter-Knife]

ORAN section id finds daggers and swords more, SKYLY also finds swords more...

[Glider]

If you play online most of the time, don't worry about it. It depends on the host of the online game, at least from what I've heard.

[Jihatsu]

Lighter (in colour) section ID's find more stuff.