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Life would be what I would go with. I don't know what kind of cycle life you get out of lipo but life is great. I've heard that most lipo also has a shelf life which isn't what you want if you are planning to keep it for a long time. I would also recommend just building it the way you want the first time around. It is very costly to redo things like a bms and charger.
I would definitely avoid lead. Its heavy, cycle life is horrible compared to lithium and it requires different charging profiles at the very least.
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