The answer depends on why you own bonds in the first place.
If the answer is: to serve as a hedge against economic contraction and equity bear markets, then you should stick with Treasuries, because they serve this purpose better than any other bonds.
If the answer is: to reduce total portfolio risk, then a total bond market fund (in tax-deferred accounts) &/or high quality munis should serve the purpose.
If the answer is: to generate postive real returns, then you're in the wrong place! Most people don't realize that historically the bond market has generated negative real returns more often (in 5-, 10-, 20-year periods) than the stock market. And starting from today's yields, negative real returns are a pretty sure bet over the next five and ten years.