Standard equipment. Battle takes place on a rooftop in Gotham City, and the Middlemen have the element of surprise. Can Bruce survive and take the Minutemen down? To get Batman motivated, he knows if they manage to take him down, they will kill anyone with any connection to him, without hesitation, when they are finished with him.
*For sake of the argument assume that Milo is skilled with a gun as any of the other Middlemen*
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Gotta go with the Minutemen. All are highly-trained and extremely proficient in h2h and armed combat. Barring any really fancy gadgets or armor, Batman would be overwhelmed.