Failure recovery.
If your flow slows to lets say half more than likely your temps would rise X amount and level off at some point. If your pump were to fail then the time would be dependent on the thermal mass of the WB and the water inside it. So a small cooler would die faster a large one would give you more time. Without doing any math I'd guess you'd have about 10-20 seconds. I read a article about a guy who forgot to turn on his pump(same as a failure basically) the water boiled and the steam blew out the block and the rest is obvious.
Parallel vs Series
I'd go with series 90% of the time but if your nearing your pumps max head then going parallel will get you more flow through each block.
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