Scarcity will govern which will drive the price up for any coin. Imagine the majority of coins were held by whales investors then no fresh coin available on the market (considering whales will hold which their obvious move to monopoly the coin). The price of BTC will surely skyrocket more than the current ATH, So comparing Bitcoin max supply to ETH with mineable coin available is not that hard, The coin with scarcity is the best to buy. But this event is way too long to happened and maybe there are other coins that possibly overtake this current 2 major coin like chainlink and so on.