I have heard of both. And what is your rig and WC setup?
I can off the top of my head think of 10 different WC 'special' liquids marketed. You found two.
It's proven time and time again on other forums by people with degrees in thermodynamics and also have been watercooling PC's for years that distilled water and a good biocide is all you need. And it's more effective than any purchased liquid that is 95% distilled water anyway.
If your loop is quality, and not made by Thermaltake or Koolance (main ones) you only need distilled water etc.
Distilled water is $1 a gallon.
I'll give you my standard WC noob cut n paste, these places have all the info anyone ever needs for any WC questions.
I'll steer you to some more technical links, please spend a few days (DAYS) reading posts, searching, learning. Don't forget to look for your case with WC. Google your case and the word watercool or some combination of that. WC stuff is larger than you think, I know from experience. WC setups done right are awesome and almost silent.
Great place, not wayyy over the top with uber WC guys.
http://www.ocforums.com/index.php
Uber place, owned by one of the worlds winning OC guys in the world. Not a place to post or ask questions by noobs, but an awesome place to learn.
http://www.xtremesystems.org/forums/
Another good place to learn
http://www.overclock.net/water-cooling/
http://www.martinsliquidlab.com/ PLEASE READ A LOT HERE, will be closed 26 Dec forever.
Great places to buy WC stuff
http://www.dangerden.com/index.php [...] e&Itemid=1
http://www.petrastechshop.com/
http://www.jab-tech.com/
Hope it helps, see ya in a few days, get edumacated!
I'm the same name on those forums.