To compete in the market, use cPanel. If you're already a established provider, you make look to start providing DirectAdmin. The demand for DirectAdmin, although growing, simply isn't there yet. DirectAdmin doesn't take over your server like cPanel, and the server will preform better with DirectAdmin installed rather then cPanel. Unfortunately like I said, you will be taking a huge loss by starting out in offering DirectAdmin. I'd recommend offering it after you are well established
