I agree the Montreal STH solo is his best. I think May 24 at Earls Court is 2nd best. Detroit January 31 is also very good. Chicago January 20 is a very sweet, melodic solo. Also, the solo in the May 17th show has moments of beautiful phrasing.
The speed and intensity of Page's playing peaked in 1973, but I think his playing in 1975 is better. He's more creative and melodic and I think there's alot of "beauty" in his music. It's hard to put it in words, but there are alot of beautiful songs Page has composed - Rain Song, Going to California, Bron-Yr-Aur, Stairway, Ramble On, Ten Years Gon