As with tomatoes, or almost any fruit, if locally-grown, or especially if you or a friend/neighbor grow it. It will tend to be much better. Even if maybe a bit small or odd-shaped the taste is often still superior. (and probably nutrition too).
A lot of store products are optimized for maximum pound yield and also easy storage/shippability in warehouses and on grocery store shelves. Though quality of some grocery-store produce has improved compared to “the bad old days” there is still a lot of fruit, and plums in particular, where there is really little going on there except it’s big and watery. Same with tomatoes unless you’re lucky.
@pmarin I have a plum tree in my back yard I planted 3 years ago. This is the first year I have fruit, assuming deer and birds let them ripen so I can enjoy. My neighbor has a large pear tree that is so productive he has to beg people to come pick fruit.