I think invest in altcoins is better than invest in btc. BTC is a stable coin in worst conditions we can save our capital by converting our altcoins into btc but if we want to get more profit we must invest in good altcoins because in a good market condition also btc price increase about 3,4 times but some altcoins price sometimes increase about 10,20 times. So, we can get good profit by investing good altcoins.