Is it better to invest into ethreum which has proved to be the most profitable and most stable altcoins
it has neither been most profitable nor most stable altcoin! i don't know where you got that from!!!
the most profitable altcoin are those with the biggest pumps, and small altcoins have always been the most profitable ones, specifically those that went from 0.01 satoshi up to 5000 satoshi last year. and it is not stable either, a pump from 0.06
BTC to 0.15
BTC and then dump down to 0.05
BTC is not called "stable"...
bitcoin which is again in the stage of bullish ride.?
bitcoin is not on any ride right now. and as far as investment goes you invest in something that has real potential not something that is going up and down based on hype and pump and dumps. and bitcoin is the only thing that has "real potential".