I think you should wait for bitcoin to about 5,500 , where you can buy it already Ethereum and bitcoin , but of course if you want to earn more then buy Ethereum
BTC prices can not be reduced to such low, the current price of BTC is touching $ 7000. And now if buying BTC is not good, so I think it's time to invest in altcoin, buying BTC at $ 7000 is pretty risky, I think. Buying ETH is ok, because ETH is pretty cheap, maybe even higher.