A LiPo pack loses runtime each time it is charges, but it is very VERY minimal!!
A NiMH loses voltage and increases IR each charge....
I know which one I would go for.
And to be honest, I wouldn't like to see one LiPo being hammered all day, I have two packs and they get to rest a little, as they still get warm under use.
As for LiPo downside being you got to buy a new charger, you have to buy a new speedo to go brushless, so I don't see it as an issue, and you really don't have to spend that much either to get a GOOD charger.
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