PulseAudio in-/output device confusion

[Petrus de Calguarium]

Output devices:

PulseAudio
Default
HDA Intel
PulseAudio Sound Server

Input devices:

PulseAudio Sound Server
Default
HDA Intel

Voilà the devices present on my system and the order of 
preference for each of in-/output devices.

My question:

Is this the optimal ordering for PulseAudio for each of 
in-/output? And why does output have both PulseAudio 
*and* PulseAudio Sound Server (is one be a vestigial 
rudiment of an earlier release)?