I like hatchery birds for the first-timer. You get a chance to try out multiple breeds, you can order all pullets if you like, and have a very good chance of getting a (mostly) female laying flock, and the price is right. Then as the hobby grows, you will most likely branch out into breeder birds. They're great too, but different in many ways. It's true that they tend to be larger, and if you're interested in showing, they are the only way to go. They don't tend to lay as well in my experience, and seem to go broody more often. I'm not knocking the broody hen. Every flock needs one. But when you get too many broodies, it can be a pain, and egg production will definitely suffer.
I still have some of my hatchery birds from a few years ago, and they're great for egglaying. Very few of those hens have gone broody, which is a plus for me. I'm covered up with broodies! My hatchery Buff Orpingtons were large ladies, and very friendly. The red sex-links were also meaty, friendly, and have been the most excellent egglayers. I've read that hatchery birds can suffer from problems with internal laying, but we haven't experienced that here. They've all been exceptionally healthy. I have a couple of Easter Eggers too, and they can come in any size since they're mixed breeds. One is small and lays the most gigantic blue egg. The other is quite hefty. You just never know what you'll get with them. That's part of the fun.
As far as Welsummers go, I've had breeder birds from 3 different lines. The first line, big girls, gorgeous speckled eggs, good personalities. Lots of show faults, poor rate of lay. The second line, gorgeous birds, unacceptable pale egg color, wicked evil rooster. The third line, as described above, skittish, stupid birds, but nice eggs and lots of them. So in my mind, breed is one thing, but line is another. I haven't been overly impressed with any of my Welsummers, for all different reasons. I only have 3 of them left. Two from the first line. They're nice girls and I can put up with the poor rate of lay when I see those fantastic eggs. The last one is one of the stupid birds, and she actually belongs to Blondie, my hatchery Buff Orpington, who is such a favorite hen that she gets to keep her annoying pal...
Every welsummer rooster I've ever had has been quite noisy. Actually, every rooster I've ever had has been quite noisy, except for 2 young breeder Ameraucanas that I have right now. Those guys seldom crow. Only in the morning when I'm coming to let them out of their coop. They're good in every way so far, and I'm enjoying them. For a pleasant change of pace. I'm not a big fan of the rooster in general.