I have read this with great interest as i was on the verge of getting a compressor one (more on this later). I have just bought an Ecoair desiccant dehumidifier DD128 off Facebook Marketplace for £80.00 and will be off to collect it later today.
Up until i read this post i would have said that a compressor was always the best, i was an aircon engineer and i know what compressor dehum does. I once had a job where the walls in a building were quite literally running with condensation, there was mould everywhere. Turns out that the outside boiler room had mesh hidden in the louvre doors, this had become blocked as was not letting air in, this caused the wall to warm up considerably and hence gallons of condensation.
We hire a compressor dehum unit and boy that thing pulled the moisture out to the tune of 8 gallons in 24hrs. and the unit was not big either.
Still looking forward to getting the Ecoair desiccant dehumidifier DD128 in my shed .