What are the differences?
Sights, cylinder, weight?
I had the same question about the 360. I went with the PD because the titanium cylinder is lighter and the sight is the orange optical, or whatever it is called.
The 360PD is so light I can carry it in a sweater pocket. The recoils stings but I can get off two full cylinders of magnum ammo (that is all the ammo I carry).
They are pricey so if you have a good deal on either version, go for it. Great carry-a-lot gun.