My Gossy pulled tremendously for a long time and I tried all kinds of tips from different collars to harnesses – once she started wearing a harness, she slowed down noticeably.
I have the EasyWalk (and measured her exactly as described) but it has so much hardware (metal adjustment buckles) that it kept slipping down her legs and she'd trip. Finally I put it on backwards (so the front strap goes over her back instead) and it works much much better - course that defeats the purpose of the original design but it does keep her in check.
However, the thing that really worked the best ... I put her in a 3-week class on loose leash walking and wow what a difference that made. Effective and consistent training!
Larz collars and harnesses
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I agree, training has got to be the biggest part in this equation, then the type of harness/collar. Ultimately do we not want the dogs to obey what we want them to do, as supposed to have a gear that forces them to do what you want them to do?
Yes, training is key. But not all animals respond the same way to the same thing. Sometimes it is trial and error as to what works best for which dog. In my house, it is individual even with the types of treat that work - Ruby prefers cheese, Brando beef liver, and Liyah chicken. IMHO, same with collars and leads.