If I see the progress, you better hold Btc, because I think Btc is clearly visible in the future development. Not for Eth because this does not guarantee you in the future, you have to invest in Altcoin in Bittrex trading, because I see Btc is now down and I see Altcoin go up, maybe if you start trading then it will get better profit for your Btc. Increased.
IMO they both don't guarantee the good future but then again it is the best we have for now. Bitcoin is too static, unflexible and so unable to fulfil upcoming demands. The biggest problem for now is trasnactions. And, if I am not mistaken, if Segwit gets implemented, at first transaction will proceed even slower.
As for ethereum - we all know it must switch to pos, or otherwise it will crush.
Eth is not the second best. It is not even in the first 20. If eth stays as PoW it will crash, if it changes to PoS then there won't be a cap on supply. > Infinite supply with a constant inflation rate = online fiat. That yearly inflation rate can be changed to whatever Vitaliq feels. No immutability = shit
There are only two alternatives to bitcoin,
1st: litecoin (which can end up like bitcoin in the long run)
2nd: monero - has no weaknesses