generally all the companies that make good dry food make good canned food as well.
when it comes to the "middle of the road" foods, the canned is often of better quality than the dry, so while i wouldn't recommend nutro natural choice dry food for example, the canned is pretty decent. as far as ingredients go, it follows the same principle as dry food - look for meat as the first thing listed and whole ingredients rather than byproducts and fragments.
while dry food is preferred by most people because it's less expensive and not as messy to handle, canned food is actually the healthier choice, since it resembles more what dogs evolved to eat - high moisture content and little need to chew (dogs are gulpers by nature, their teeth are made foro ripping, crushing and tearing rather than chewing).
personally i wouldn't feed a dog strictly on dry food with nothing else added. even with the best of foods, it's still very much like a person living on frozen, canned and packaged food alone.