For me the first test is flute or better yet recorder (only because like you, I play it). You hear right away whether it sticks to the sound or - more often, unfortunately - sounds plastic.Nice comparison, thanks for sharing! Still - even if it's less appealing to listen to: I find it more revealing to check the wet-only results of pink noise bursts (about 300 ms long).
That was why I was enthusiastic about the first VSL reverb when I had it.