I would tend to trust the Dr. Tim brand. He is the person who isolated the correct nitrogen cycle bacteria when Marineland started marketing it as Bio Spira.
I cannot be sure if he has gotten on the bandwagon of selling stuff just 'cause it sells or if he is really developing and selling viable options for the aquariums.
Perhaps a carefully worded e mail to him, including a brief history (like I saw you did for the Seachem question) might help. Here is a link to Dr. Tim's web site:
That Tropical Science label sure looks familiar, but it has been a long time since I used it. Here is a link to their site. I am less inclined to trust this one, because I looked at their cycling product (Nitromax) and it has the wrong bacteria. It has been over a decade that the right bacteria were identified. Any company still selling the old strains is not one I would trust.