Egg size/production is very much the most important factor. Bird size is 100% secondary. I would also put broodiness above bird size, but below egg stuff.
I actually have a SS or two that I might keep moving forward because they are so broody. I just wouldn't allow their eggs to stay under them because I'd be aiming for bigger birds.
I should have also asked in my original post, but in any of these breeds do you find the hens to go broody? It's actually a trait I would be looking for.
Thank you for the suggestions so far.
So I wanted to go the route of the Speckled Sussex because they are touted as a dual purpose bird. After not being able to find a good hatchery, I took a chance from multiple and sorted the best I could. Turns out I have small birds that lay small eggs. Are they beautiful? Yes, but I don't...