My Delaware isn't aggressive, but she is definitely the leader of the pack. She is a good forager and as you mentioned very strong and healthy. I can pat her and she will occasionally fly up on my shoulder when I am bent down to fill the water, but other than that, she is pretty independent and struts around like she owns the place. If you want a hen that is a good layer and very healthy, not to mention pretty good looking! Go for the Delaware. You won't be disappointed.