Generally a good, smooth, clean show jumping round happens when you have the right quality of canter, and your horse is rideable and adjustable between fences. If your horse is lacking in rideability or adjustability, it does not matter how great the canter is that you start off with - as you will find that the quality of your canter will likely diminish as your round goes on. And because your horse is not easily adjustable, you will probably be unable to truly fix it while on course.
I will start by defining and discussing the difference in the meaning of the two terms, and will then give you an exercise that will show you exactly how much of either quality your horse currently possesses! This exercise can be adapted to suit all levels of horse and rider, and all disciplines of riding.