Hmmm.... I believe you are looking at the tables bass ackwards. Mesh type indicates lower labor rates than the ladder type, as it should IMO.
Upon reviewing the data, yes, you are correct.
I do not see any reference to load weight, span length, or NEMA rating. It could be a apples to oranges comparison, where the load is so light the strength of tray and span between supports do not matter.
With cable tray, when you see "number" "letter" in a specification the "number" is the span in feet between support and the letter is the number of pounds per foot of capacity where A= 50 pounds per foot, B = 75 pounds per foot, C = 100 pounds per foot. So NEMA 20C tray, supported every 20 feet can carry a load of 100 pounds per foot. In addition there is a safety factor.
Basket type tray does not offer this NEMA load rating. Its up to the manufacturer to provide load and span rating information.
So yes, ignoring load capacity and support cost, just looking at labor for the tray alone, lightweight basket tray would be a faster installation when comparing it to a heavyer rated traditional rung style cable tray. Lightweight data cables could be a example where fill rate is reached before load rate.
As the load weight increases the span length of basket tray gets so small traditional ladder cable tray becomes more economical due to the reduction in needed supports.
I hope that helped.