Comparing taxable to tax exempt bonds, which yield to use?

I am retired and looking to compare what would be a better investment in my taxable account between a tax exempt bond fund vs a taxable. I know the formula is the yield/1-tax rate. What I am not sure is what yield to use. The funds show a TTM yield and a 30 day SEC yield. Depending which yield I use sometimes tax exempt makes sense, other times its taxable. Which yield is the one to use? Read more here >>>

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