Per a quick search, while Illinois is second (to New Jersey) on property taxes, Texas is only 5 states behind. And on sales taxes, Texas also has a base of 6.25% with a total of 8.25% in most locations. So there really isn't much difference in the sales and real estate taxes between Illinois and Texas, but the outcomes are quite different.
True, but Texas has no income tax.
So that is 5% of money earned a year less than Illinois. Also, Texas has total sales tax capped at 8.25% across the whole state—no exceptions.
Chicago has 10.25% total sales tax, and being 5 states down from Illinois for real estate taxes is an order of magnitude. Illinois is a ripoff and Texas is a bargain.