Owen and the Bulldog easily... MNM was not even about Mercury or Nitro it was all about Melina and getting her over, much like T and A was about Trish Stratus, and in that respect MNM served its purpose. Bulldog and Owen however were a tag team with so much more depth, they had a great moveset and family ties, and true family tag teams always make stronger tag teams, its just one of those things.