Back on track
At a guess I would say there would be more Jarvis walkers in garages across the country than any other brand. Most likely shimanos a close second.
As for the most popular individual model...a WILD guess maybe a baitrunner. (????) They’ve been in production while and are not priced out of reach for most people.
However if we called an alvey a single model rather than the brand that would most likely replace the bait runner at the top of the tree
JIM