Which surface to stick weather strip to?

It's getting near time to weather strip my teardrop project. I have home built doors. I am using a Fredricks style door seal area with the inset seal surface.
As I look at the seal area I wonder which is the best area to attach to? Should I mount it on the inner frame of body opening or the door?
On the body looks prone to bumping or snag from enter/exit. Especially the bottom piece. Yet I think the seal is also used as a gutter to channel water away from the opening.
I think I can mount seal to door and still create the water gutter effect at the body when the door is closed.
What's the best way to do this?
As I look at the seal area I wonder which is the best area to attach to? Should I mount it on the inner frame of body opening or the door?
On the body looks prone to bumping or snag from enter/exit. Especially the bottom piece. Yet I think the seal is also used as a gutter to channel water away from the opening.
I think I can mount seal to door and still create the water gutter effect at the body when the door is closed.
What's the best way to do this?