I agree with the sentiments that Johnson is more highly regarded for business in general, however, I think it's important to stress the goal of operations management.
Operations, especially in oil & gas, has a strong pairing affinity with engineering and information systems. Carnegie Mellon is one of the top engineering and computer science universities in the world, and Tepper is one of the top operations schools in the country often sharing the best reputation with MIT Sloan. A lot of operations is pure analytics, and if you know much about corporate analytics, then you know it lives or dies by the strength and quality of information systems. Tepper is one of the rare schools in the country that has an extremely strong information systems concentration available as part of its MBA program.
The biggest operations case competition in the country is hosted at Tepper. Tepper is one of just five North American schools that participates in AT Kearney's Global Prize Competition (3 of the 5 are M7), and there's also a consulting course that works on a real project with AT Kearney.
This is one of those scenarios in which career fit truly trumps an edge card in overall brand.