When running two batts. together, a question

[magman]

I am undecided as to what configuration, series or parallel, I will be running in my conversion..Revo..

My question is this, I know that a 30c battery is supposed to be better under a load than say a 20c battery...so...when running 2 batts together, since drawing from 2 batts, instead of 1, is it not as imperative to have such a high c rating...correct?

I am looking at running either a 4s 3000 20c in parallel or a 2 2s 6000 in series which will yield me the same in the end as far as cells and mah....

Also, is one set up easier on the batts. than the other or are they about the same as far as wear and tare goes.