As a general rule, domestic stocks (particularly those that pay lower dividends) and tax exempt bonds should be in your taxable account, where international stocks, taxable bonds, and REITs should be in tax deferred accounts.
The Bogleheads guide to retirement planning has a full prioritization list that's good to look at.
However, there are exceptions.
If you have a lower risk tolerance in your taxable portfolio than your tax deferred portfolio, you should still diversify with bonds. I personally do this, as my taxable portfolio may turn into a house down payment in ~5 years.