I'll throw my hat in the ring here as someone who does a ton of profiles and also tests them. Owning a full-service hockey shop gives me the ability to have access to try all different combinations of skates, steel, and profiles. Yes, I am lucky, but this also comes with negatives as well considering I change configurations so often I sometimes physically hurt myself s and it most certainly does take its toll on my skating as well by changing equipment so often. Such is life.....
BTW, when I say I hurt myself testing, I am dead serious. I hurt my back not too long ago, slipped a disc. I was testing an unreleased pair of skates with a very aggressive Quad 0 profile that was applied, it still had the full pitch in it and my back just couldn't handle the strain exerted with being so far forward. My back and core were constantly engaged fighting against the extremely stiff skate and the pitch of the profile and something had to give... Something did. My back.
Anyway.
Quad 0.5 is a great overall profile and as mentioned, what I typically like to start players on if they are coming from steel that has not been profiled previously. It's also very good for new adult players, as the pitch is something they are not yet accustomed to and can throw off their skating. For the young kids, I prefer to put them on a single longer profile until they develop advanced edge control. This allows them to focus on skating and not worrying about balance as much.
Quad 2 would be my second go-to. The Quad 0/1 removes a very large amount of steel and also add quite a bit of pitch. Once you blend the toe properly many people feel too far forward and they get short choppy strides due to balance issues and such.
There are so many factors I think we can all agree that its truly impossible to say what is the best method and what to use for each player without seeing. Not to mention that some skates have a built-in forward pitch, like TRUE, and many other skates are very neutral. For example, skating on a Quad 0 using the "Pro Sharp recommendation) on my TRUE skates makes me feel unbalanced. When I do Quad 0/1 I tend to remove most of the pitch from the profile to preserve steel and also lessen the forward pitch. I can always add more pitch later but I cannot add steel back once it's been removed.