All of them are part of my portfolio. The logic is simple BTC will inevitably be the goto store of value - digital gold if you will.

As to the dominant digital currency, it has to be a POS smart contracts coin - so ETH, ADA, or DOT. Why speculate when you can own all three?

And finally, SOL introduces Proof of History, a potentially revolutionary new system. So that's also worth holding.

A few others I hold are BAT, MATIC, and LINK