DeSoto County is interesting because it has million dollar McMansions for the Memphis white flight. But it has poor blank towns like Hornlake. I went to a mall in DeSoto County. Quite a cultural clash lol.
The dynamics of DeSoto suburbia are strange because, unlike Tennessee, Mississippi has a state income tax. I suspect the highest-earning Memphians would prefer to stay in TN, for this reason.
If you work in Memphis but live in DeSoto, you wouldn't pay state income tax. You pay where you do the job.
This is a misconception. If you are a resident of MS, you will pay MS income taxes. If a resident of MS has taxes withheld in another state they will get that back on their MS taxes in the form of a credit, but since TN doesn't have income tax that doesn't diminish their tax liability in MS.