I am fairly new to knitting but I have found 12 inch circular needles and try to use them as much as possible. I start the toe with ML on a long needle and as soon as possible move to the 12 inch.
I find 12 inch circular save time by not having to slide the needles for ML or two circular needles back and forth. In addition there is not a problem with ladders as I more from one needle to another.
Down side is you can't use 12 inch for casting on, need to move to a second circular needle at the heel and you can't try the sock on as you go.
There may also be a problem for those with small feet, I wear mens US size 13s, and if you do an intricate pattern you might have difficulties.