Ethereum seems to have the best network effects, developer community and actual capital running on it. If eth2 succeeds, it would probably be the winner, but there are lots of challengers, like polkadot.

You might get yourself some BTC (as a reserve asset for defi), some ETH (as the oil or the machinery which makes the smart contracts go around) and maybe some DOT in case eth2 fails and dot delivers.

p.s. personal opinions, not responsible for losses, etc etc.