I have just recently been given the second system on your list and I think it does a pretty good job. The fog when combined with a moderately strong computer fan in my experience drops the temp about 10F. The system itself does have a few odd ... characteristics haha.
The unit jets a stream of water into the air and from this stream the vapor is released, so it splashes. If left running for any length of time, the water gets EXTREMELY hot yet the mist remains cool. This heat will build up if you put the unit inside your terrarium producing the opposite of the effect desired.
To counter this, I have placed my unit in a sealed container (an OxyClean bucket) with tubes running from 2 aerators (all I have at the moment) into the container. The bucket allows me to have a reservoir of water to cover the auto shutoff sensor and gives splash protection from the hot water. The bucket needs to be big enough for the mist to evaporate off this stream otherwise you will get poor mist production. After you do this just punch a hole in one side of the bucket and run tubing into your terrarium to transport the mist. The whole container will get very warm but the mist will remain very cool. I would suggest using a computer fan just to provide more air movement (which will help combat fungi as well as provide a better cooling effect).
You must use the purest water you can with this system. If you do not, the ceramic disk clogs and you have to take it apart and dip it in vinegar every few days to remove the salts that will form on it.
I believe the evaporative cooling effects of the fog+wind are what cause the temp. drop. If you want a picture of what I have set up just drop me a line and I'll be happy to take some for you.
Hope this helped,
-J.P.