Original Pro Staff
The list is way, way too long if you include all of the lower-ranked guys (playing satellites and money tournaments) and college players in the 80s and 90s.
That and the Prince Graphite (the 90 and the bigger one) were by far the most popular sticks I can remember. The old Dunlop Max 200G had a following too, as did the Head Graphite Edge. OF course there were Rossignols, Spaldings, Kneissls, Snauwaerts, Donnays, Slazengers, Estusas, Pumas, Zebras, Kennexes, Volkls, etc. But I'd say the PS 85 has earned its place in the pantheon. Probably at the top. Obviously, it's one of the finest sticks ever, but for whatever reason, a lot of players have moved on.
Seems like a lot of guys from the PS85 era switched to Prestiges/Radicals/Muscle Weave 200gs/different Pro Staffs and the like....or they went with some midplus, slightly wider shafted frames after that. Among my crowd (former college players, teaching pros and guys who were pretty decent players), there's been a return to the heavier frames over the past five or six years.
Let's see if I can list the sticks of the cats I hit with: Pro Staff 95 classic, n6.1 90, n95, various Volkl 10s, Head Prestiges and Radicals, lots of Babolat Pure Controls, a Pure Drive Roddick, and AeroPro Control, Fischer Pro no. 1 and Mspeed, various Dunlop 200Gs, Dunlop 400 something, Prince O3 red, and one guy still has a bagful of the cool Snauwaert ATP Tour 85 that is basically a Pro Staff knockoff.