Far, far more important than "pro"-biotics are "pre"-biotics.
Probiotics merely attempt to introduce a limited range of non-lethal bacteria, most of which get killed by the acid in your stomach before reaching the gut.
Prebiotics are the foodstuffs that your existing gut bacteria thrive upon. You're probably better off eating some fresh raspberries than any amount of "delicious, probiotic yoghurt", with or without fruit.
In fact, just peeling and eating a banana probably beats the benefits claimed by the marketing moguls of branded yoghurts.

Fermented foods like sour pickles, sauerkraut, miso, natto and yogurt have beneficial probiotics.