The one that came first is called Hanco's and it's located in the old Tea Lounge spot on Seventh Avenue and 10th Street. The other is called Henry's and it's located in the old Slope Suds spot on Seventh Avenue between 14th and 15th Streets.

Both, apparently, serve delicious Vietnamese sandwiches. The Brooklyn Paper does a compare and contrast. There's also a bit of controversy because the owner of Henry's used to work at Hanco's. He's being accused (by the owner of Hanco's) of stealing the secret recipe.

I tried a sandwich and a bubble tea at Hanco's a few months ago and thought it was delicious!