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I wish I knew. If I did I would be buying those all up. As of right now I would guess Bitcoin (first mover), Ethereum (wallstreet firms backing it), possibly ripple or steem (for different reasons). Other than those your guess is as good as mine...

Coin Marketplace

STEEM 0.06
TRX 0.29
JST 0.045
BTC 67446.02
ETH 2013.13
USDT 1.00
SBD 0.52