The Super Panoramique went into production in 1967 and was renamed the Champion. It was a 3-axle 40-foot coach with slanted windows and was built until 1981. Most were 96" wide, though a handful 102" wide models were also built. There were also a few 35 foot, 96" wide buses. The Champion was the first 40-foot coach in the industry other than Trailways' Eagles and Greyhound's Scenicruisers.
The first Panorama coaches were built specially for Murray Hill and featured the curved side windows that would make Prevost famous. Tecnically it was similar to the Champion. In1971 it was made available to other operators and in 1973 it was renamed the Prestige. Like the Champion it was built until 1981. There appears to have been built one 35-foot Prestige, but the standard version was 40 foot long and 96" wide.
The Le Mirage was introduced in 1976 and also featured the curved side windows. It is easily distinguished from the Prestige by the lack of the "step" in the roofline. From 1983 onwards a 102" wide version of the Le Mirage was built as the Le Mirage XL. This one became the standard and Prevost's best-selling coach. The XL-version also received new sqaure head lights and a different tail-light group. There have been a few 35-foot Le Mirage, though most of these were motor homes.
The bus Viv is looking at must be a Prestige. The Champion had different style windows.