If their respective conditions are reasonable, they are both good and very usable cameras. The P has a decent finder with more frame lines, but in my view the finder is not quite as "ergonomic" as on the S2. The S2 has only 50mm framing (requiring external finders with non-50mm lenses), but the S2 finder has more eye relief and is just very eye friendly. If one is changing lenses frequently, the P might be a better choice. The P is also a less expensive camera and probably a little newer than the S2. Nikon rangefinder mount lenses are fairly plentiful, but not quite as easy to find in all focal lengths as LTM lenses, although some of the Nikon fit lenses are a compelling reason in themselves to support a Nilkon RF mount body purchase!