You should look at which currency actually has a future and bet on that.
For me this is Monero because code talks and bullshit walks. If you rely on an instamine and big marketing budget to pump the price instead of letting the code speak for itself then any gains will be unsustainable.
Zcash is off the table for me because it isn't trustless.
future will be define on what the project can bring, its really hard for us to join the ride if we don't have any idea which is which that have good progress from the project itself not just because they have been helped by big whales and play with the price but knowing what project will last
and continue accompanying btc on its journey to succeed.