I'd think the difference is...
one large harvest
or
several smaller harvests
each plant is going to require the same investment in time & materials whether you run 8 at once or 1 per week over the same time period and, all things being equal, should produce the same amount, per plant.
In scale, the equipment sufficient to perform with 1 per week would most likely be insufficient when used for 8 at once though, again...all things being equal...
put another way...
large Seasonal harvests might be better suited to growers with the experience and equipment to fully exploit that method where the small-scale perpetual harvest might be better suited to those without.
Seeing as I fall into that latter category I am probably talking out my ass...