The constant tension (stock) clamps seem to work better,as they do stay tight. I have found regular hose clamps tend to loosen as the hose shrinks and hardens with age. They also tend to seal all the way around,which most gear clamps won't do,and will sometimes seep,especially on smaller diameter hoses.
They are a pain to get on and off unless you have the right tool(s). I have about 5 different styles to get the various different clamps off at different angles. You should be able to get 90 percent of them with just the regular straight ones.
Only time I have found them to leak is when someone has butchered them by using regular pliers (such as needle nose @ 90 degrees),which bends them and stretches them,or when they are overcompressed.