I won't be much help here, but I'll give it a shot.
I have seimitsu joysticks in my cab, and I'm also building a DC joystick with a seimitsu in that.
Seimitsu sticks (and I don't know the term for this) have a square motion. Like, if you move the joystick around in a circle, it moves in more like a square... It's kinda weird actually. It can be awkward, but they are nice sticks.
My friend just got a new astro city cabinet and it has JP sticks in it. I don't know what brand they are, but boy are they nice. They mount like an american joystick if i'm not mistaken. They are smooth as can be. I kinda wish I had those in my cab. If those are sanwa sticks, I say go sanwa.