2 sets of tomato plants, 1 fruits, the other doesn't.?

I have two sets of tomato plants. 4 of them are Better Boys and 4 of them are the Beefsteak. Both sets of plants are huge, almost 4 feet tall. The better boys are growing better and they have fruit on them. However, I have yet to see a single piece of fruit on the beefsteak tomato plant. Am I just being impatient or have I done something wrong? I've seen the answers about nitrogen and I haven't added any fertilizer to my plants. Just stuck them in the ground. Both plants are flowering equally. Both sets of plants receive about the same amount of water. Any ideas why the one set grows fruit and the other doesn't?