Green cabbage is so cheap at the grocery, and we eat perhaps three or four heads a year, so we don't bother with it in our garden. But, the red cabbage is more expensive and harder to find, so we usually put in a half-dozen starts, and get four or five nice heads (not basketball size, but big enough to merit the effort).
We find they attract bugs, but that can be taken care of with insecticidal soap and BT; the cabbage also requires more water, a consideration here in Texas if we have a dry spring; and God bless the bunnies--they love cabbage. We plant in the fenced seasonal garden to deter the rabbits. As I write this, I'm beginning to wonder if the red cabbage is worth it . . . .