I can't believe you can't figure this out...
Exposure. FATS has been doing this for a heck of a lot longer than VirTra, and thus they have a much larger footprint. VirTra is the new man on the block, it takes time to develop a marketing base to the point where they can seriously compete.
They have an outstanding product that apparently, in the words of the people who are purchasing it, outshines the competition like the sun outshines the moon. But that doesn't mean that VirTra is in the already established position such as FATS enjoys.
It all takes time. And Money. VirTra sold its first IVR early this year, FATS has been selling devices for 20 years: "Over 4,000 FATS training systems are used worldwide by military, law enforcement and commercial customers."
You are trying to compare an acorn to a watermelon. Plant the acorn and the watermelon, wait 20 years, and tell me which plant is larger?
Lets revisit this question a year from now. Mark it on your calendar.
Andy