I have both a Day and a Wurtz (and a Lula), all planted summer of 2015 from 3-gallon pots. The Day is the most compact, perhaps because it loses some afternoon sun due to a neighbor's tree.
Got about 20 avos from the Day; it fruited ahead of the Wurtz. Day avos were okay (Wurtz had better taste), but the skin doesn't peel as easily as, say, a Hass. The Wurtz and Lula peel more easily than Day when ripe. Not dissing the Day - I'm okay removing the skin in pieces or with a knife in return for an early avo! The Wurtz produced just 3 avocados, the Lula 10 (the best taste of the three I have).
Also, haven't had any disease issues with any of the avos, and haven't needed to spray anything to ward off disease.