Just thought I would explain a little bit.
I have no idea which product is better than the other, nor am I trying to make any suggestions on that point. My only input is about the video and the link it comes from, as to whether the information in it (or lack there of) is reliable. I am a website owner and I know many tricks that people use, legal or not. The site growersunderground.com (I would make it linkable, but I don't want to give them any creditability to search engines) is simply not of the same standards that the Advanced
nutrients site is.
Every page of a website should be able to be accessed somehow from the homepage by linking to that page directly, or a page with the link on it. Rule of thumb in the industry is that every page should be no more than 3 clicks away from the homepage. The lack of any information, and other linkable pages from the homepage leads me to believe it's what is called a "lead page" (to generate leads).
These types of pages are designed to get people interested in something so they will give there personal information (usually a e-mail or phone#) to get more information about it. They usually do give you the promised information, but the real goal is to get your personal information. Once an extensive list of this information is harvested they then sell the information. Just because a site says that they don't sell personal information does not mean they don't, you need to prove they did or they can continue to do it.
I also know how to find out the information about the site I need (like who the owner is), but simply don't think it's worth my time to do so. Legitimate or not, I would do much more research before I bought the products. I like to get information from different sources before I trust it. Also I would never give my personal information to to a site I think might be harvesting the information.