Both of Bitcoin and altcoins are falling down now. You can choose anything you want. But my advice is Bitcoin. It will recover soon.
True.Now bitcoin is again start to reduce.This is the correct time to move of Bitcoin also. Always, the altcoin is best. But you have to choose the correct one.Some of the Altcoin next to Bitcoin is ETH,Waves and lite coin.You can choose any of this altcoin or analysis the best and inverse in that Altcoin.