4S1P VS 4S2P lipos?

It's not quite as simple as all that. If the two packs are rated the same, such as...

2s2p 5000mAh 20c
2s1p 5000mAh 20c

You will not have a higher current rating from the 2s2p pack. The 2s2p pack will be composed of 4 2500mAh cells, while the 2s1p pack will be composed of 2 5000mAh cells. However, both packs should perform very nearly the same, taking into account difference in cell quality and manufacturing.

In short, there is no way for us to answer your question without knowing what packs you are asking about ;).


J.