I only hit with Confidential during the TW test of the string and in looking back, I would say that tension maintenance was good but not as good as Silver 7 Tour. Confidential also wore faster for me - I think I got about seven hours on it before it notched more than half way through, at which point it's right on the verge of breaking. Silver 7 Tour is good for at least 10 hours and more like around 12, so it's at least 50% more durable while maintaining good playability until about the last hour before breaking.
Silver 7 Tour does have a tendency to shear break the mains on mis-hits. Since I tend to swing pretty freely and mis-hit fairly frequently, I've experienced more than my share of these shear breaks. But I keep going back to it because it grabs the ball so well, has more than average pop, and just doesn't force me to change my game throughout that first 85-90% of its lifetime.