I see all the comparisons for battery life and price. I have used the Zippy Compacts and been very satisfied. One thing not being talked about is the weight. This is where Thunder Power Lite 25C packs outperform all the other good packs. If you are just flying around as a sport flyer, scale flyer, quad flyer it doesn't matter and price/value is a good benchmark. If you fly stunt were 1/4oz is important then from what I see in the market right now only Thunder Power Lite packs are for you. The RC Juice comes a close second for some packs.
In electric our one weakness is choices in size/weight of motor/battery packages. You almost have to choose the motor/battery then design around that weight. Right now, the BadAss motors seem to be giving very high power for their weight. You can usually drop one motor size and use the same prop/rpm with them. Again, if weight matters these are worth looking into.
Happy New Year, DennisT