Running Packs in series or parrallel

[Matthew_Armeni]

I have a question that doesn't pertain to me since I run single packs but I'm curious and I figure you guys know LiPos better then most so here it is-
If I'm running 2 LiPo packs, in an E-Maxx let's say, is it better to A-run 2 2S 8000 packs in series or B-run 2 4S 4000 packs in parrallel? And could you explain why one is better, or why they are the same? Or how about C-run a 4S 8000 saddle pack? Thanks!