I know a pressure COOKER uses heat and pressure to cook foods faster. You can make even a cheap roast into something great with a pressure cooker. My Mom used to use hers for beef tongue.
I bought the wife the Pressure CANNER from All American. She already has a pot for non pressure canning. She has made a ton of jams, jellies, apple butter, peach butter, squash butter and the like. Our property has raspberry vines, apple trees, huckleberrys, peaches, cherries and plums. So, she has been busy.
We purchased a steer this year, and we just had it butchered a few weeks ago. I figured on cooking up some of the roasts and then canning them, as well as green beans, carrots, peas and some other veggies.