If you're thinking about putting money into bond exchange traded funds (ETFs) rather than mutual funds, you're not alone. Fixed-income ETFs have pulled in nearly $344 billion through Oct. 31 this year, compared with $138 billion going into fixed income mutual funds, according to Morningstar Direct. It's part of the larger trend of investors preferring ETFs: In October alone, about $74 billion flowed out of mutual funds, while ETFs attracted $166 billion. And while ETFs have some advantages over