I think Kirk Hinrich, Tony Snell, Doug McDermott, Taj Gibson/Nikola Mirotic, Nazr Mohammad is better than Delly, James Jones, Mike Miller, Marion, TT. I doubt we'll ever see the two benches really go at it (actually I know we won't) but just based off the individual pieces on each bench I think Chicago pretty easily has the more versatile and capable bench.
And yes...Taj Gibson is better than Marion. I don't even think that's a point that can be discussed. I think most would agree with that statement but they play two different positions so I'm not sure why you brought that specific matchup up.