I've got a few interviews lined up for tech writing positions. I could and should be pursuing additional corporate blogging positions; why aren't I? I have to think of the right answer for that and get back to you.
Partial answer: securing a (paying) blogging position is an uphill battle, to convince a company that they need a blogger, and then to explain what a blogger does and why it's a good thing, and then to make them let me do it. OTOH, technical writing is a known quantity and people are happy to pay me for it.
And I need the money.