Your dabblers (mallards, teal, black, woodies, pintails, gadwalls, etc.) are going to be the best tasting.
Diving ducks (canvas back, mergansers, redheads, buffleheads, scaups/bluebills, etc.) generally aren't going to have as good a flavor because their diet is significantly different than dabblers.
Keep in mind that a whole lot of it is contingent on how the bird is prepared. I've found that most people that swear duck tastes like [censored] have eaten only duck that is far overcooked - in which case it won't matter if it is a diver or dabbler.
Teal wood top 2- divers best prep in trash can. I avoid them like the plague.
Canvasbacks are actually not bad- in sausage
Shooting ducks and throwing them away is called Wanton Waste and it's against the law. If you're advocating for that on a public forum, it's time to hang the waders up and take up golf because you're a liability and disgrace to the hunting community and its just a matter of time before you become fodder for anti-hunters.
The fact that you would even put Canvasback and sausage in the same sentence tells me everything I need to know. You don't like eating duck? Then either give them to someone who does or don't hunt.