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@PlumpCat Keep in mind the chemistries and form factors are mostly independent... You can find virtually any chemistry in any form factor.
LiFePO4 is my favorite all around... Li-ion usb chargables are super cool, and as NiMh is quite nice when you want to abuse your batteries :)
I have a huge 12V car-battery style battery which is actually Li-ion and the charging regulator is built in, so you can charge it by just attached 14V to it and walking away.. even has a little battery % indicator... being as large as it is it has insane power capacity while being fairly light.
@freemo I would if I had run into half those chemistries! I'm a HUGE fan of NiMh though. LiPo is amazing for it's unlimited form factors and unparalleled power density.
NiMh wins in the cold, it wins when it comes to overcharge (which lends to really flexible trickle charging options with tiny solar), it's form factor means you can add it to anything that would take 3 double A's and they are just neat overall.
LiFePo4 however is quickly becoming my new favourite!