The issue with comparing bacterial products is that the manufacturers list a "proprietary blend of bacteria" as the ingredients in most cases. There is a certain element of trust with the specific manufacturer when it comes to bacteria. I'd say that if you're comparing Vibrant to an equivalent Brightwell product, you're probably best off comparing it to MicroBacter Clean.
As far as cycling a tank goes, we have the most experience using Dr. Tim's products. If you've seen any of his MACNA talks (we have them on our YouTube channel if you haven't), you know that Dr. Tim Hovanec is an industry expert on the topic of bacteria. I think anyone would be hard pressed not to use his products after the knowledge that he demonstrates in his presentations. I've yet to see any other company or company representative be so open about teaching the reefing community on this particular topic.
All of that said, we're going to be doing a BRStv Investigates in the near future comparing tank cycle times between the various bacterial products. While it won't tell us things like exact types of bacteria used in each product, it'll be a good insight into which products work best for getting a tank up and running the quickest and which have the correct bacteria strains for the job at hand.
I used to work in a freshwater metagenomics lab where we sequenced environmental samples to identify the bacteria and viruses present in the environment (like 7 years ago at this point). I'm more in the realm of human viruses now and would consider myself a virologist than a catch-all microbiologist (no more bacteria) at this point, so I'm by no means an expert on the topic.
BUT if you guys want to get fancy, you could try having the raw products or samples from the water column and rockwork/substrate sequenced to shine light on the differences between these products via either shotgun sequencing or 16S sequencing. I haven't done this in a while, but based on my experience with similar technology now, it could easily be under $1000 total depending on how many sample you wanted to send out.
I've used company called BGI for RNA sequencing several times in my current research, they offer some really good deals for that and are full service (you give them an unprocessed sample, so you don't need a tube) It looks like they have a metagenomic offering too that might be cheaper.
BGI Americas’ metagenomic sequencing applies whole genome shotgun sequencing of DNA isolated from environmental samples, with high throughput and high coverage.
www.bgi.com
or
16S/18S/ITS sequencing is widely used in taxonomy and molecular phylogeny. BGI has extensive experience providing affordable 16S/18S/ITS Sequencing services.
www.bgi.com
16S will give bacteria taxoonomy and abundance
18s will give eukaryotic taxonomy and abundance
^Best for high complexity samples (we used this and were working with thousands of taxa)
Shotgun sequencing will give the above, but can also pull out some specific bacterial/eukaryotic genes (for instance, if there are genes for nitrate reductase) and any DNA viruses (will not sequence RNA based viruses)
^You'll get more information about each individual organism/strain the less complex the sample is, aka the less types of bacteria that are present. For bottle bacteria, this is likely to be the better option unless it's much more expensive^
There are a few others listed on on Google if you search for "metagenomic sequencing service" as well:
https://www.cd-genomics.com/Metagenomic-Shotgun-Sequencing.html (they say the offer 16s/18s as well)
Shotgun metagenome sequencing services with pricing preserved. Species- and function-level profiling with optional bioinformatics.
www.mrdnalab.com
USA Based Lab Guaranteed Data Security
en.novogene.com
Bacterial, viral, fungal and archaeal sequencing: WGS, 16S/ITS amplicons, shotgun metagenomics, and transcriptomics with optional bioinformatics.
www.mrdnalab.com
If you consider doing something like this and need help understanding the technology or analyzing & interpreting the data, I have experience and can lend my aid! I can direct you to one of my papers to confirm I actually know some stuff about this if it seems feasible to do for a video.