Pigs - They clear guardens of unwanted weeds and also provide quality meat if they are intended to be eaten.
Goats- great characters and depending on breeds produce great milk or meat.
Geese- only had mine for for about 9months before Christmas, but give very good meat, and hours of fun, and are good guard "pets", Lay very large eggs, good for baking with.
Owning any animal is a huge reward, moral boosting, even better to think that you may be saving the environment by eating your own produce.
These may just be my views, but here they are anyway
Cameron