I'm a little from column A, and a little from column B. I'm a shower in the sense that it's about 6 inches long when soft, but a grower in the sense that it reaches anywhere between just over 7.5, and just under 9, depending on just how hard I am.
I haven't encountered any major disadvantages so far. But, one of my friends, who is a major grower, has told me he loves it, because he has the element of surprise. Women aren't expecting a lot, so when his bean becomes a beanstalk, they're almost always impressed. Then on the opposite end of the spectrum, there was this guy I knew in high school, a shower, who's cock was about 5 inches long when he was soft, and had an OK girth. There were plenty of guys who were jealous in the locker rooms, and he loved to play up the idea his dick was huge. Well one day I was over at his house and long story short, I gave him a blowjob. But, when he got hard, his dick didn't grow at all. It was still only about 5 inches, and barely any thicker. Totally anti-climactic moment.