Well, Im no expert and not an RC god so I wouldn't exactly know what amount of current needs to be drawn from battery to consider it good/better. But I know that A123 has lower current draw rating than Lipo but better than NiMH. Also this things are not like Lipo that explodes and needs LVC or their goners. I think I favor more on being safe than just a few more current draw rating with the trade off of extra care. Besides 5S2P is enough to power my EMAXX for 20-30mins and still do wheelie on demand...top speed of 35-40mph is also easily achieve
But I could be wrong...maybe others with more experience can answer you
