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The benefit of a 12-point box-end wrench was that it gave you a better range of movement, but that is unimportant on a racheting socket wrench. On a non-racheting socket wrench (i.e., a breaker bar), the 12-point socket might be useful.
In support of my position that 6-point sockets have better grip, I'll offer up page 177 of a Navy manual where they advise using 6-point sockets: http://www.nsgreatlakes.navy.mil/engineering/unitfour/4-1.pdf
To see for yourself, insert a nut into each type of socket and observe which has more metal-to-metal contact.
You could also ask your local auto mechanic to tell you how many times they skinned their knuckles using 12-point sockets before they learned their lesson.
I'll concede that for undamaged, non-rusted nuts that aren't torqued too tightly, a 12-point socket works fine.
I did remember one advantage of the 12-point socket, you can use it on square nuts.