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If your takling about just to choose without thinking about what to do with it later on, then 100 BTC for sure and then HODL till bitcoin reaches the 20k USD mark again. We all know bitcoin is bound to rise again so I would rather have bitcoin and treat it as an investment with great future prospects. Else I would take the 850k USD and buy 101.88 BTC according to current rates or other altcoins like Ripple, which I think has great prospects.