This is just my opinion, but Ovation's current Glen Campbell "signature" guitar has nothing to do with Glen, other than the signature. Do a little research and I think you will see what I am talking about. From Ovations PR and ad release.
Ovation has meticulously hand-crafted a precise recreation of Campbell's iconic “1771” model guitar
Glen never played an Ovation 1771, iconic or otherwise.
70’s vintage-style electronics to recreate the identical guitar tone of Campbell’s original six-string
was acoustic only. If Ovation is referring to Glen's first steel string Ovation acoustic electric...that would be the Ovation Glen Campbell Artist Balladeer Model1627.
features a shallow, "Vintage Style Lyrachord" body used on early Ovations from the 60's and 70's
Well, maybe Ovation was using "Lyrachord" as the material, the bowls from the 60's and 70's were totally different, not only in appearance but how they were made.
In 1969, Glen Campbell became one of the first-ever Ovation Guitars endorsers and via his nationally syndicated television program, “The Glen Campbell Goodtime Hour”
Glen was using Ovations in 68...which may have been on the "nationally syndicated" Smothers Brothers replacement show...So I will give them a slight pass on that.
A contemporary version of the electronics that launched the Adams acoustic/electric line in 1979
It is "Adamas", not "Adams"The line was launched in 78
All of that to say, the new Ovation should have spent a little time to polish up on, not only Glen's history, but their own.
As far as...
"which models are considered the best-sounding and best-made?"
You cannot go wrong with any deep bowl, A braced Ovation...such as a Custom Legend (which Glen LOVED to the very end)...or you can go to the Ovation Fan Club
and look through the archives. There is a ton of information about many Ovations, that are considered best sounding...you will do well to do a little investigating on this. As far as "well made" ... all of the American made guitars are going to be well made.