Speech marks - double or single?

Which do you like? And which do you use?

I prefer double, but I've always used single in my novels, for the simple reason that the key is right there, conveniently to the right of the semi colon, not requiring the Shift key. For double, it's Shift and 2. I believe on USA keyboards it's more accessible, which may be why they've stuck to double while in the UK these days we use either.

Now I am cursing myself for taking the line of least resistance. In order to accommodate American readers when I e-publish, I made the change in Heart of Rock, and it's been far from straightforward. Find and Replace changes all the apostrophes, too, and it takes hours to track each one down and correct it. And I care about apostrophes.

I'm not sure I've succeeded, either; I think I'll have to print the book out and read it through, possibly with a ruler under each line. Which is really annoying, as the typescript was, as far as one can ever say, typo-free.

Instead of an appropriate image, here is a nicer one of the blackbird who makes himself at home in my workshop. He's sunbathing.