Brandywine i thought is supposed to be a great tasting tomato but not productive.
If sticking with Heirlooms...
My favorites in terms of taste are the black/russian tomatoes.
Black Tula and Paul Robeson are always dependable and didnt really crack/deform/'catface' on me past few years.
Nyagous always was a perfect small black snacking tomato.
Chocolate Stripes was one of earliest tomatoes for a larger size tomato and last pretty late for me too.
Cherokee Chocolate and Japanese Black Trifle are also some other favorites of mine...
I think for the non-russian/black tomatoes... taste and productivity I really liked Homer Fike's Yellow Oxheart. Large, pretty, and had alot of them esp considering how big they get.
San Marzano Redorta for a good tasting paste tomato.
Green Zebra was very prolific and pretty. I'm also debating planting more green heirloom tomatoes this year, cause the birds poke holes in the darker/redder tomatoes and placing a dish of water on hot days hasn't stopped them. I just cut around the hole, but still a nuisance.
If you just want the poundage and disease resistance, and don't care much about the taste (cooking only?) then the non-heirlooms tomatoes I see at the community garden always seem to be ridiculously packed with tomatoes.
PS Also for the indeterminates, they can get pretty big... I wish my cages were 6ft tall instead of 4ft. When the tomato vines can reach 8-10ft tall, so when they fall over my 4ft cage, and based on my spacing start getting into the shade which I think promotes more disease towards end of the season. Just getting them up higher *I think* and pruning better to promote sun reach all parts of the plant and cut down on disease. or i can space them further too (but i like having 35 different varieties of tomatoes a year to test out in my little garden
).