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I prefer BTC, cause Altcoin market is depended on the price of bitcoin.
Current Bitcoin market is on a bull flag and it is sure price will not fall before next halving,
so it is better to hold Bitcoin for a long time, I think it will not disappoint us.
But dont forget mate because alt coins can grow more than what bitcoin can give in a short period of time so still diversification is the best way to handle our investments here
Yes, Altcoins may able to grow more but trading alt coin is really painful and anxious. The future of Altcoin is uncertain. Bitcoin is better if you want to do risk free trading.