bdunbar79 has some good experience and insight to the question. Both would be good for what you want other than the tungsten issue he mentions, so it comes down to cost and features.
What are the prices of a 1dsm3 Vs 5dm3?
Do you need bullet proof build?
As far as portraits and landscapes the edge may go to the 1dm3
Do you need new features of the 5dm3?
Is weight an issue?
Given what you want it for high iso isn't needed.
Both have good focus but the edge would go to 5dm3 and its spot focus as well as live view focus for portraits that allow you to see extremely zoomed in on the 5dm3.
You just need to do a checklist of wants and see where things end up.
What are the prices of a 1dsm3 Vs 5dm3?
Do you need bullet proof build?
As far as portraits and landscapes the edge may go to the 1dm3
Do you need new features of the 5dm3?
Is weight an issue?
Given what you want it for high iso isn't needed.
Both have good focus but the edge would go to 5dm3 and its spot focus as well as live view focus for portraits that allow you to see extremely zoomed in on the 5dm3.
You just need to do a checklist of wants and see where things end up.
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