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Is litecoin less volatile as Bitcoin ?

I also suggest that you consider Kurtosis when comparing financial instruments. Btc’s Kurtosis is about half that of ltc’s, this meaning less extreme movements and more predictability.

Ps it is incorrect to generalize by saying that lower Kurtosis means better returns. At the contrary, long tails represent an opportunity if one can handle them.
 
if you are interested in other coins you could consider following an index investing approach. Rules-based investing is always better than impulsive investing.