I intend to purchase some BTCs/ETHs into my blockchain wallet but I'm still sceptical about which of the coins is better and won't fall below the water. I am asking this because I don't understand how the cryptocurrency market works yet.
In addition to all of the above, I do not recommend that you keep large amounts of money using blockchain.info wallet, there are many people who have reported a problem with it and the fee estimate is high.
Buying Bitcoin or Ether is the least likely to lose compared to many altcoins, but this does not mean that it is a profitable investment. Overall, both are good, but Bitcoin is the best.