Gareth... I am in southern middle TN... that is about as detailed as I care to give out online.
Maya - that tater has eyes, and legs
Kysang - I have grown cherokee purple in the past, and they are excellent on flavor... a kin to the famous Brandywine tomato... which I think has the best taste of all.
The problem with both brandywine and cherokee purple (in my garden, or my area) is that they are low producers, and don't do well at fighting off early or late blight.
Burpee crossed the Brandywine with their Better Boy tomato a few years back, and I have had some success with them. They are more disease resistant, more productive, and the tomatoes are nice, large, red, roundish tomatoes that do not split and cat face as much as brandywine does. I have two of those out there in my garden now and am looking forward to eating those. One slice usually covers the bread and then some.
But still even though the taste is good, nearly as good as brandywine, they do not produce anything near what the Big Beef does.
The Big Beef have good taste, not as good as brandywine, or cherokee purple, but they do taste good enough, and they make sure that I get my quota of canned tomatoes put up for the year.
Below is a pic of some of my big beef tomatoes from last year, showing how they produce. One Big Beef tomato plant (in my garden) will produce as many tomatoes as 3-4 Brandywine, or Cherokee Purple (easily).
I am also growing some Rutgers this year, and hear they have really good taste and are heavy producers. We'll see, so far they are looking good and they are doing better or as good as the Big Beef on leaf blight so far.
My two brandy boy tomatoes are already getting those bullseye spots on the leaves, more so than the other varieties. I just keep pruining the infected leaves and leaf sets off as it shows up.