Definitely pears because they're my town fruit and they're really cute. Also my favorite fruit irl because they're really good. I don't understand why more people don't like them in AC.
Peaches are my town's native fruit, so I've grown to really adore them. I love their pastel-pink hue normally, and their bright golden color when they are perfect is quite nice too!
The perfect version of the fruit pretty much determines if I like it or not. So I like apples the most. I find the perfect version elegant somehow haha. Cherries are my second favourite, which is also my native fruit in my current town. Oranges are my least favourite as I think the perfect orange look really weird.
I actually really like pears now because they tend to blend in with the trees. I used to look for towns with apples or cherries because I had pears already, but I've gotten used to them now to the point that I think they're my favourites. I still love the look of perfect apples though.