Oh Geez! I could NEVER pick just one. Last year I had 3... in pots on my porch... because I could never do just one. This year I'm going to have 20+ plants and I have at least 13 different kinds. I always need one good for cooking, I need a good slicer for sandwiches and of COURSE cherry tomatoes that I can eat while I'm out in the yard or on any salad I make.
I've got several pear tomatoes, green tomatoes, a white tomato I'm dying to try. There is also some lovely italian reds for cooking and a Roomji tomato this is like the beefy tomatoes for slicing. I've got chocolate cherries, sweet 1000's and so many more!!!
This will be the first year I don't have Roma's. Each year they've done worse and worse.
Just think of what you are going to use them for most. Salads, cooking, sandwiches, eat 'em like an apple with some sea salt (one of my favs)... then chose one you'll enjoy the most use of. Just remember... heirlooms are popular and it will save you a lot tooking for seeds every year if you save your own. Good for saving $$$ as well.
oh my let me see hummmm 
Oh Dear how to decide...
It all depend on what you want from a tomato do you want one that will make a sandwich with just one slice or cherry's for salads or plum for canning or???? or???? or???? Hummm 
Brandywine most definately brandywine...then again...............................
This year, I got a yellow tom from Baker Creek called Azyochka (or something like that). Hope it's good. I also love Brandywines, although mine didn't do too hot last year. I'm hoping for better luck this time around. 
I pick the good ones for momma and daddy , and then when the peppers are hot enough i will pick some green to go in pepper sauce!!
