Well, it's definitely more simple. I use it on my VPS to manage my personal sites and it works fantastic. It's much cheaper than cPanel cPanel is quite robust, secure with regular updates.
cPanel has more features than DirectAdmin, but due to the increase in pricing, many people are starting to use other panel software like DirectAdmin or Plesk.
I think that cPanel now occupies the lion's share of the market and deservedly so. Another thing, of course, is that the constant increase in price makes this product less and less attractive to new users.