Bitcoin will remain as always even if the price will go down, it is somehow considered to be traditional and believable crypto from the side of people and crypto community. Of course the next will be Ethereum. It's the 2nd largest cryptocurrency in terms of market capitalization and on top of the list for daily traded volume, and because of smart contracts Ethereum is so popular and valuable. Then, EOS and Monero will take their firm places. The fifth one is very personal, However, I choose ripple.
We can't argue for more about ethereum's strong foundation about it's contract and it was established with a great community as well. I think other coins that following the stepping stones of bitcoin and eth, they've been doing their very best to reach the bottom line of every development. With this strategies, the potential growing value will gain a fair price for every holders if crypto market reaches the on top.