I grew some brandywine and Chocolate/purple Cherokee some years back with some seeds from one of the seed sharing offerings on here.
Found the Cherokee a horrid colour and a bit off putting.
Taste wise all found them odd, quite a sharp acid after taste. Maybe that is a family personal taste.
But only grew a couple of plants that did produce ok. If I remember about five toms per plant about 3-4 inches per tomato width.
For brandywine found they grew very big, tomato width about 4-5 inches. Only had about five tomatoes per plant.
So would need to grow more if you like plenty.
They needed some pretty strong stakes and more than usual ties to keep them upright.
They were tasty and much the same as my Marmande, but a lot bigger.
Do find my regular Marmande crop better. Although big, tomato width 3-3.5 inches, they are not as big as Brandywine.
Normally get about 8-10 per plant and after picking about first five that have ripened, another five then will set.
This year have ten plants. Grow one plant in a 9 inch pot outside and use a string from under the root up to a height of six feet above on a bamboo cane rail.
They are a lovely tasting tomato, I mostly slice off the top, remove and mix the contents with a little basil, contents back in, top back on and roast in oven. Just delicious.
I have picked a few this morning along with some San Marzano (that I use for my yearly frozen tomato paste) as a size comparison.
Always fun to try many varieties, one thing that sharing seed on here has been fun with over the years.