The panotools wiki has a good comparison of different projections of the same photo. Google Streetview uses equirectangular pictures to store 360° images. Panini is another type of equirectangular.
Examples
Panini: https://wiki.panotools.org/File:Ben_Equirectangular_panini.j...
Equirectangular: https://wiki.panotools.org/File:Big_ben_equirectangular.jpg
Full list: https://wiki.panotools.org/Projections