I grew Sophie's Choice this year as a small, determinate tomato. It was my earliest producer by a long shot, and the tomatoes were amazingly large for such a small plant, and the flavor was great for an early tomato. I will definitely grow this variety again.
I think it is an OP tomato (or possibly an heirloom). We've probably harvested at least 15 tomatoes off of a plant that is barely 2' tall, and there are still several more ripening.
I've also grown Silvery Fir Tree--also an early producer, but the tomatoes were much smaller and not as flavorful as Sophie's Choice.
Linda