Raspberries and blackberries are cousins but have distinctively different flavors.
Growing organic berries is mostly initial preparation and then constant applications of compost and mulch.
Since they are susceptible to viral and bacterial diseases, resistant varieties are easier to grow.
In the Landscape
Being a rather loose, vining type shrub, raspberries and blackberries should be relegated to the back of the garden.
They make a good boundary plant and the thorns make a good defense. Especially marauding pets and teenagers in the neighborhood!
In the Kitchen
They can be used interchangeably for the most part in the kitchen.
Blackberries tend to be a little sweeter than raspberries.
Traditionally used in desserts such as pies, ice cream and custards.
Preserves and jams can be used off season to make sauces for ice cream and desserts.
May also be used in savory dishes as a sauce or condiment to go with grilled meats & fish such as salmon. Or even in making meat roasts & gravy.