When comparing a multitude of smaller batteries to larger batteries and the point of being equal is price or especially weight, these are the typical differences-
Not every time but if there a difference, the aH and reserve capacity of a small quantity of large batteries will usually be greater than a lot of smaller batteries. However, the capacity difference may not be that crucial of a difference even by up to 25%.
By me saying this, i would also say that CCA and CA would also be greater from a small quantity of larger batteries because of the duration.
However, when it comes to 5sec discharge, it's very possible that a bank of smaller batts would excel in less voltage drop over a smaller large case battery bank.
I can practically guarantee with certainty (minus batcap 8400 \ 8400extreme) that when comparing like battery lines in terms of weight capacity, that the smaller bank will have incredible amount of discharge capability.
Odyssey PC1200 vs PC2150
PC1200 has 1200A for 5sec, 42aH, 38lbs $222
PC2150 has 2150A for 5sec, 100aH, 78lbs $377
10 PC1200s = $2220, 12000A for 5 sec, 420aH, 380lbs
6 PC2150s- $2262, 12900A for 5 sec, 600aH, 468lbs
In this example, same price, 5sec discharge equal, aH big difference and 90lb weight difference.