12s is more inclusive.
A LOT of our fans are women. Not a majority, but enough that they should not be disregarded.
Say what you will but 12th Man does 3 things:
1 - Seems to omit/overlook the just as important female fans
2 - Confuses us with the A&M people, and if you knew any - you would know you don't want to be confused with them. Gross.
3 - Removes the stupid copyright issues for a trademark that A&M never should have been granted in the 1st place. Apparently in Texas, seeing there are 11 people on the field and naturally adding one more is crazy innovative stuff. Here I think we know how to count to 12. (See #2)
I prefer "The 12s" more than the 12th Man. 12th man sounds like one extra guy, the 12s sounds like a Horde.