Dunno about Argentine Bahia, but Pensacola Bahia is not a bunch grass. It's a very common grass here, easy to get started, pretty drought resistant, grows thick, with a seed head coming on about once every 2 weeks if grazed or mowed, then let grow (lots of people use it in their lawns too)
My Bahia stayed green until the first hard frost (27 degrees) this year. The big plus for Bahia, is the amount of seeds it produces--you can drive thru the pasture in mid summer and you'll have thousands of seeds on your front bumper. It makes a huge seed bank, and I always let each pasture go to seed at least once/year.
Tifton9, which is just a variation/improvement of Pensacola bahia, does good here as well, tho a little easier to get going than Pcola, and seed is more expensive to buy--usually about X2 as expensive. Needs plenty of moisture (rainfall) in it's early stages. I planted some early this year and it is doing good. I do not cut hay--just graze it. Cows eat it up--it's just a faster growing forage and a little finer and longer leaf than Pcola bahia.
TiffQuick to me, is the way to go. Germinates faster, provides more forage than either Pensacola or Tifton9, but I don't have any yet.
Dunno how it will do in N.C. and I've never had Army worm problems here so I can't say one way or another on that aspect.