I actually thought the Manor was much lighter, because it is so much more comfortable on me than the Willis. I just hauled both bags out and I think it's close. Maybe the nickle hardware has a different weight than the brass. I wish I had a scale for small items!
Anyway, I'm taller - just over 5'9 1/2". I thought the longer strap would be great for me as both bags can be worn cross body on a taller frame. Something about the Willis just bashes into my hip, though. The Manor is much, much more comfortable on me, but sticks out a bit so is not the most flattering look for the bag. I get now why the Court is so popular - it's a bit small but slim to the body when worn by the strap.
To answer your question, I think the Willis may hold more stuff, but it's all chucked into one space. The Manor is more civilized

with better organization capabilities.