IL vs MO in Greater St. Louis?

[Dan Forguson]

Searching for my next investment property in the Greater St. Louis area and, being new to property investing, I was wondering if there were compelling reasons to choose either IL or MO in STL (other than property tax differences). Any cautions with landlord-tenant laws on one side vs the other? I’m currently looking for a multi-family (duplex or 4-plex) and find myself going back and forth. I live in IL, but work in MO (and have another rental property in MO), so I spend equal time driving on both sides. Thanks!