> The big difference is, -as I see it- I will not get real polymorphism,
> as the base class would need to do the join on all it's child classes.
> Is that true?
with abstract models you won't get polymorphism at all, in the
database level (this is, you WON'T be able to do Fruit.objects....).
You'll mostly just be sharing structure and behavior, saving yourself
some repetition.
With multi table inheritane (MTI) you get three tables, one for Fruits
one for Oranges and one for Apples, Fruits have a row for every Orange
and every Apple, so you can do Fruit.objects.all(). Knowing whether
this is an orange or an apple is trickier, but not too much
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