Just chiming in.. I have not read all the responses yet but will do so later..
I've had several breeds so far, and i would say that the Rhode Island Reds were always reliable and worked well past the 'expiration date'. I've not ever tried a hybrid of that breed. I do think those might be better. And as far as being a nice bird.. I had two and one was grouchy and mean and the other was sweet as can be- a lap chicken. If I'd go outside she come and find me and follow me around, even if I didn't have food. I think it all depends on the bird. They are all different.
I also second (or third, or forth, or whatever) whomever said about the Black Australorps... Mine have all be VERY VERY healthy robust fearless sweet stable birds. I had one that as a chick had spraddle leg. Put a splint on it and she grew into a healthy beautiful productive hen. I also have two Jersey Giants who are also just the same as the Australorps. One of those is standoffish while the other is personable.
I have a brown leghorn who surprised me lately with more eggs. She is over two years old and had stopped but she is now laying again. I guess she was not finished after all! She was very productive also before.
The most important part of the quoted post: I think it all depends on the bird. They are all different.
And that is your real answer
You can make generalizations about every breed and while there are breeds that are known to lay more eggs per week than other breeds, any individual bird will do what it will do. My birds all came from Ideal as day olds June 13, 2012. I give them about an hour of morning light in the winter because the coop is on the west side in the lower part of a barn and 10' from the outside wall so even though the sun is up, there is no natural light in the coop for some time after sunrise.
I have one Black Australorp that has averaged 3.77 eggs per week since she started laying 11/26/2012, stopping only during moult. Average egg size 63 g (just shy of XL). The other is BIG, laid her first egg 1/3/2013, averaged only 2.66 per week, goes broody sometimes and takes the winter off. Average egg size 68g (mid range XL) and she sometimes lays MASSIVE eggs, the largest was 114g, just shy of 2 Large. The smaller girl is friendlier and is interested is what I am doing outside (because it may mean exposing bugs when I'm pulling weeds
) but the larger isn't mean, just isn't as interested in what you are doing.
My second best layer is the EE averaging 3.5/week but she takes the winter off after her fall moult. The smaller BA didn't have her first moult until the end of January 2014 (in Vermont where it is COLD in the winter) and laid again 2 months later, a month after all the girls that quit in the fall started. She moulted again starting mid October last year and started laying early January when ALL the other birds were off. So read that first italicized line again.
Things to keep in mind:
1) What you have seen here is mostly "mine do this" with no information on how old the birds are, where they live or if they are given 14 hours of light year round (which is what the egg factories do) to keep production up.
2) The pullets of most any even moderately decent laying breed will lay through their first winter. Even my Cubalayas, definitely more yard art than egg layers, laid through their first winter. On average they have laid 1.4 per week for one and 1.5 for the other. The second goes broody. So when you see people who post how well their birds lay, they might be talking about their first ever chickens, all pullets, all first winter.
3) How important is the number of eggs per week vs the number of eggs in the bird's lifetime? Meaning: are you going to get sex links, which from my reading lay really well the first couple of years and burn out, then eat them when they slow down (explain that to the grandkids) and replace with new chicks or breeds that generally lay a longer portion of their lives? Black Australorps and White Rocks are supposed to be good in this regard but *I* have no personal knowledge.
4) If you want the grandkids to be able to pick up an animal and love it to death, get a dog. Some chickens might be OK with this but most are not. And teach the grandkids that
THEY HAVE TO RESPECT the chickens' desires. You want really flighty chickens? Let the grandkids chase them around trying to catch them to "love". That is not love, it is abuse.