This is not a ranking, nor am i intended to rank them here. I collect and own all these dongles, which none of them are sent to me for measurement or review. As my collection expends, more will be added and they will be alphabetically arranged by brand / model names.
Source: Sony Xperia 1 IV (1kHz since wave via Frequency Sound Generator)
Load: 32 ohm dummy load
Tools: Power-Z KM003C / BK Precision Model BK2712
Note that with different source, load and measuring tools used, result can be different. Therefore please do not see these data as an absolute truth but more of an approximated guideline, especially when comparing to measurements elsewhere. Thus guide is most useful for comparing power consumption as they are all measured under near identical condition, but how much it will translate to your use case is still depends on your own setup.
Cayin
RU6
SE Draw: 5.18V 0.19A 0.98W
SE Output: 0.096V 13.8mA 1.32W
SE OI: 0.5 ohm
BL Draw 5.18V 0.23A 1.19W
BL Output: 0.188V 25.3mA 4.76mW
BL OI: 1.1 ohm
RU7
SE Draw: 5.19V 0.15A 0.78W
SE Output: 0.097V 14.0mA 1.36W
SE OI: 0.6 ohm
BL Draw 5.18V 0.18A 0.93W
BL Output: 0.189V 25.5mA 4.82mW
BL OI: 1.1 ohm
ColorFly
CDA-M2
SE Draw: 5.19V 0.14A 0.73W
SE Output: 0.094V 14.3mA 1.34mW
SE OI: 0.2 ohm
BL Draw: 5.19V 0.15A 0.78W
BL Output: 0.187V 27.7mA 5.18mW
BL OI: 0.3 ohm
FiiO
KA5
SE Draw: 5.19V 0.15A 0.78W
SE Output: 0.093V 14.0mA 1.30mW
SE OI: 0.2 ohm
BL Draw: 5.19V 0.16A 0.83W
BL Output: 0.186V 27.7mA 5.15mW
BL OI: 0.2 ohm
KA17
SE Draw: 5.18V 0.20A 1.04W
SE Output: 0.094V 12.8mA 1.20mW
SE OI: 1.0 ohm
BL Draw: 5.18V 0.22A 1.14W
BL Output: 0.127V 14.4mW 1.83mW
BL OI: 2.7 ohm
SE(D) Draw: 5.20V 0.03A 0.16W
SE(D) Output: 0.094V 12.7mA 1.19mW
BL(D) Draw: 5.20V 0.03A 0.16W
BL(D) Output: 0.178V 20.1mW 3.58mW
Hiby
FC6*
SE Draw: 5.19V 0.18A 0.93W
SE Output: 0.095V 13.8mA 1.31mW
SE OI: 0.6 ohm
*Source’s digital volume applied
HiFiMan
HM800*
BL Draw: 5.19V 0.09A 0.47W
BL Output: 0.100V 16.1mA 1.61mW
BL OI: 0.2 ohm
*Source’s digital volume applied
iBasso
DC-Elite
SE Draw: 5.19V 0.16A 0;.83W
SE Output: 0.094V 14.9A 1.4mW
SE OI: 0.2 ohm
BL Draw: 5.19V 0.18A 0.93W.
BL Output: 0.187V 29.3mA 5.48mW
BL OI: 0.3 ohm
iFi
GOld Bar
SE Draw: 5.19V 0.17A 0.88W
SE Output: 0.091V 14.6mA 1.33mW
SE OI: 0.2 ohm
BL Draw: 5.18V 0.19A 0.98W
BL Output: 0.179V 26.8mA 4.80mW
BL OI: 0.4 ohm
Luxury & Precision
W2
SE Draw: 5.19V 0.16A 0.83W
SE Output: 0.099V 15.9mA 1.57mW
SE OI: 0.9 ohm
BL Draw: 5.18V 0.17A 0.88W
BL Output: 0.196V 30.5mA 5.98mW
BL OI: 0.5 ohm
W2-131
SE Draw: 5.19V 0.14A 0.73W
SE Output: 0.099V 15.9mA 1.57mW
SE OI: 0.2 ohm
BL Draw: 5.19V 0.16A 0.83W
BL Output: 0.197V 30.5mA 6.00mW
BL OI: 0.4 ohm
W4
SE Draw: 5.19V 0.12A 0.62W
SE Output: 0.095V 12.7mA 1.21mW
SE OI: 1.5 ohm
BL Draw: 5.19V 0.14A 0.73W
BL Output: 0.182V 20.5mA 3.73mW
BL IO: 3.1 ohm
… To Be Continued.
ClieOS' Audio Titbit 
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