FPS based on last frame is good to see load spikes, particular periodic ones, if you graph them.
FPS based on the median of a moving window is good if you want perceived frame rate, which rejects extreme outliers.
FPS based on the average of a moving window is good if you want statistical mean frame rate.
> FPS based on last frame is good to see load spikes, particular periodic ones, if you graph them.
This.
The other two are not good for anything gaming as any framerate inconsistency breaks the experience. A stable frame rate is much more important than a high one.