I use a 120W G-unique and a 300w G-Unique Archdaemon Limited edition, and the following Pico units: 120w, 150w and 160w.
Never had a moments issue with any of them.. the 12w Pico is over ten years old and had plenty of service, the 150 at least 8 years, and the 160w about 4 years. Of course the G-unique are much newer, a year and 2 years.
Absolutely no telling them apart when system is running and have great faith in the Pico units I have used. I am no authority, but do remember what has let me down and what has not.
I looked at HD-plex and G-unique at same time, preferred the 12 volts in to the 19volts of the HD-plex that required a further stage to get to 12 volts, and at the time I bought I think the HDP had not been updated for quite a while if I remember comments correctly, whereas G-unique was ever evolving and I just liked the approach. Solely based on my preferences.
Also be careful about overdoing the PSU, bearing in mind the efficiency band of these can be on a fairly high user demand, dropping quickly in efficiency as the PSU is under-utilised.
As an example of the opposite, I am building an AB350 Gaming ITX, with a 2200G, Samsung 250Gb 850 Pro, 1 TB 2.5" Toshiba HDD or Seagate firecuda SHDD ( not decided which yet) and 16GB (2x8 ) 2933 DDR4.
I will be using the 120 watt G-unique for this. Not a gamer machine fairly light duty, and the power draw band is circa 31w idle 131 w full load, so happy that the 120w will be ample for it.
Not really advice, just some things to chew over in the quest to get what you will be happy with.
PS: I use a Realan EW-80