Question: Which is the better choice?

Usage: Landscape primarily, possible for some studio work as well. High ISO, video, and Servo AF are not factors in the decision at all.

Money wise a lightly used 1DsIII is in the same area as the 5DIII, or a bit less. Weather sealing goes to 1D3. Remaining shutter life favours 1D body. Are there any compelling reasons to pick one over the other that any of you can see at all for this expected use? Interested in your thoughts and opinions on this.