I say both : blackcoin and dogecoin are not really good choice.
I say: if you want to find best coin around and you don't want to risk your money too much : choose bitcoin.
Yes agree currently best option is only bitcoin because in last few days as bitcoins rising all alt coins going down badly If you want to do any thing then just invest in bitcoin nothing else
Amen
This is very true at the moment as Bitcoin price would not fall 50% or more ... that's pretty sure and it is not sure for each other coin.
So .. if you want a best investment in the world of crypto -
BTC