It's the same in that most fruits and vegetables you can buy at the store have been bred for quantity and shipping. Home gardeners can grow varieties that are bred for flavor. So my Nebraska Wedding Tomatoes may not survive a trip across the country with UPS, but they taste amazing. And my Double Gold raspberries don't produce bushels, but they're the best I've ever eaten. I do think I'm probably saving money growing garlic. Very low maintenance plant, and I grow enough to save what I need to plant for the next year. So some crops are pretty cost effective, but some are really for the flavor.

More noticeable in Tomatoes, but everything is more flavourful. Potatoes are more Potatoey, leafy greens are more intense flavour, some people finding home grown romaine too strongly flavoured because they are used to it tasting like nothing

Not all, but most. I don't notice much of a difference with peppers or carrots, but strawberries especially are incredible when grown from a garden and pretty tasteless when bought from a store. Tomatoes don't have quite as significant of a difference, but they're still much better. I don't think I've ever gotten fresh beets from anywhere but a farmer's market or my garden, so I'm not sure about them.