I'll say I like the original more (Milwaukee)... but I find myself biased towards all things Milwaukee. Red Rock Saloon in Madison is pretty spacious, with a bar in the middle and seating all around. Then stage in the back corner and a bull once you walk in. It's quite an inviting atmosphere. If memory serves correctly, there is also a smaller bar off to the right of the main entrance. It's been too cold to utilize the patio (unless you're a smoker... then it's never too cold to be out there) but I think that will be a nice spot to go during the summer. Which, for outdoor seating ... Madison may have the edge over Milwaukee.
It's a Country bar... if it's not obvious by the logo or other clues along the way. If you don't care for that style, this bar is not for you... go for the food, not for the party at night. But if you like Country music, this will easily become your favorite Madison drinking spot!