One of the weakest headed plants I've seen in such a long time, Duncan's would win hands down for this tomato plant that doesn't look strong enough to grow. Most of what seedlings that did germinate were blind plants, even two of my friends got a blind plant, so no idea what causes it, maybe genetics.
You may remember me cutting the plants to allow the axillary bud to grow into a new sideshoot, then I managed to find one with a growing tip and now you'll find that the strongest plant in my second garden bed is Duncan's. See photo.
Duncan's - supporting a blossom bag.