I know that Black Locust trees can get very tall, up to 80 feet, and can have a pretty wide spread, maybe about a third of it's height. About the only redeeming quality that I ever found, was as an intruder deterrent. They've got thorns that will leave you with memories for a long time. In all fairness, when they're in bloom, and in the fall, they can be quite beautiful. Those that I've seen have been in pasture and wild type settings. They've always reminded me of Bonsai work. I enjoy them in woodturning because they give some interesting detail.
The Honey Locust doesn't get quite as tall as the Black does, but not much shorter. It's also thornless (correct me if I'm wrong, it's been several years since I've seen one) and is more of a fuller tree. I think I heard somewhere that it was a good tree for making bows, and it's also a good woodturning tree.
I don't know if that helps, and it's been so many years since I've seen these trees, that my memory may be flawed.
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