I'd go 2x vs. 1x for this reason. Lets say you need 6000mah pack to make a 20 min race. 2x 6000mah 2s run in series packs are going to be cheaper than one 6000mah 4s because there is much more volume on 2s packs so they price them cheaper per mah. Then you also have more selection due to many 2s pack varieties. Then, if you do mess up one cell in a 4s pack you might have to toss all of them as rebuilding a pack is a pain. with 2 x 2s packs you can just toss the one that has the bad cells.
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