If you could take any two faction from any of the Fallout games which two would you pick? N.C.R. & Brotherhood of Steel? Legion and Enclave. Master's Army and the Shi?

Which would benifit the wasteland the most? Which could do the most damage? Would any of them be able to unite what used to be America?

I'll put a list here (let me know if I forget any)

Ceasar's Legion
East Coast Brotherhood of Steel
East Coast Enclave
Followers of the Apocalypse
New California Republic
Midwest Brotherhood of Steel
Mojave Brotherhood of Steel
Mr. House
Shi
The Master's Arrmy
West Coast Brotherhood of Steel
West Coast Enclave