While both protect teachers, Missouri protects teachers more. Teachers in Iowa can still be fired if given enough reason to be fired. Whereas, Missouri teachers a virtually not allowed to fired after they receive tenure.
I would feel more secure in Missouri, but I know myself and know that I will do my best. I worry that tenure sometimes keeps bad teachers in the classroom.
Citations: http://www.topeducationdegrees.org/faq/how-do-teachers-get-tenure-status/
https://mnea.org/Missouri/LegalServices1/Tenure-Frequently-Asked-Questions-8.aspx
http://www.mvlsun.com/article.php?viewID=8756
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