Whatever type of clamp you use it seems that the rubber is stuck to the fitting and wouldn't leak there anyway.?I don't live in the rust belt, and I couldn't count on the fingers and toes of everyone in my shop how many spring clamps I've seen rusted out on Northern cars. On average, I have to cut off 2 rusted out clamps each month that have lost the opening fingers to remove them and no longer hold proper tension. And on cars that aren't rusty, I can often solve leaks by replacing weak spring clamps with worm types. Some of them have been so weak I could remove them by hand. After about 3 years, I don't trust a spring type clamp to hold.
As for worm gear clamps, I've seen a handful go bad. Usually it was over tightened and the worm gear pushes against the band and lifts up the cage that holds the worm gear causing it to slip. I'd say this happens once to every 30 or 40 failed spring clamps.