You are missing something
##You are missing something## TheThe grappler (the one controlling the grapple) gets +5 on his grapple checks - both breaking the grapple and taking control of the grapple use the same opposed check - with the same modifiers (including the +5 to the grappler).
There's no advantage in one or the other, you can even roll the opposed check first and only later state whether you wish to break the grapple or become the grappler (I think it's also presented that way in the chart...)
If You Are Grappled
If you are grappled, you can attempt to break the grapple as a standard action by making a combat maneuver check (DC equal to your opponent's CMD; this does not provoke an attack of opportunity) or Escape Artist check (with a DC equal to your opponent's CMD). If you succeed, you break the grapple and can act normally.
Alternatively, if you succeed, you can become the grappler, grappling the other creature (meaning that the other creature cannot freely release the grapple without making a combat maneuver check, while you can).