most of these have same core so I don't think there would be much difference in SQ. However you can do a bit of tweaking and thats where you can gain or loose.
Not sure what is done in Moode as I have not tried that cos it lacks some bits which I need for my streamer kit to be fully working.
Volumio, RuneAudio and Moode all use MPD as player so if you play with mpd.conf you can change SQ
here is my config which I using in Volumio
Code:
###################################
# Auto generated mpd.conf file
# please DO NOT edit it manually!
# Use player-UI MPD config section
###################################
follow_outside_symlinks "yes"
follow_inside_symlinks "yes"
db_file "/var/lib/mpd/tag_cache"
sticker_file "/var/lib/mpd/sticker.sql"
log_file "/var/log/mpd/mpd.log"
pid_file "/var/run/mpd/pid"
music_directory "/var/lib/mpd/music"
playlist_directory "/var/lib/mpd/playlists"
state_file "/var/lib/mpd/state"
user "mpd"
bind_to_address "any"
port "6600"
zeroconf_enabled "no"
zeroconf_name "volumio"
filesystem_charset "UTF-8"
id3v1_encoding "UTF-8"
gapless_mp3_playback "yes"
auto_update "no"
group "audio"
max_connections "20"
audio_output {
type "alsa"
name "Output"
device "hw:0,0"
mixer_device "hw:0"
mixer_index "0"
dop "no"
auto_resample "no"
auto_channels "no"
auto_format "no"
}