I like all three methods. My original flock members were feed store chicks, which of course came from some hatchery. I got 8 common breeds. I also got them about a week or so old, so the survivor factor was high. 1 of 8 "pullets" turned out to be a cockerel. I still have four of those original eight, two years later.
I bought two gorgeous "pullet" bantam Cochin chicks about five weeks old from a local breeder, but one of those two was a cockerel. The pullet died for some unknown reason at Point of Lay (POL),and I suspect she was egg bound.
I have ordered sexed pullet chicks from both Ideal and MPC, plus sexed ducklings from Metzer Farms, and been VERY happy with them. Lost a couple chicks, had two incorrectly sexed, but overall very, very satisfied with the service and the quality of the poultry.
I have also hatched shipped eggs from breeders, and while the successful hatch rate wasn't all that great, enjoyed that seven months period of time during which I was obsessively hatching specialty breeds not found in feed stores..... And this was before I trusted ordering chicks delivered through the mail. (Many complaints on BYC about lost shipments, dead chicks, "wrong" breeds sent, etc., scared me... But I am now a fan of online ordering for chicks!)