I agree - Barred Rock. NOT SLW. I have both.
I would be disappointed if I got BR instead of SLW. I like my Wyandottes much better than the BR. I currently have 1 GLW and 1 SLW pullets. In about 3 weeks I will be adding another GLW and 3 BLRW. My GLW is very friendly and was a great layer all winter. She layed a large to x-large egg every day. Now she is laying an x-large nearly every day that does not fit in cartons very well. My SLW just started a few days ago after taking the winter off.