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We have two options already, either each and everyone of us prefers btc or eth with different purposes as long as you're earning sustainable profit. In relation with online buying, I just hope in asian countries it would be implemented as well. What if, lazada and shopee's local online store would have merged cryptocurrency on their system, that's much easier and convenient to do online shopping instead of cod payments.
But I think people will choose bitcoin over ethereum because they believe that bitcoin will be more popular than ethereum. Perhaps, they will try to use bitcoin to buy something in the online store, and I think they are curious about using bitcoin as the payment method.
Suppose Lazada and Shopee's online store can merge or use cryptocurrency as the alternative payment system. In that case, that can attract more people to those two online stores to see the advertisement or on the payment method page. They will be excited to see the crypto is available because they can use directly from their wallet to the online store.
With this question, I think you are very new in this cryptocurrency or the rest of the private world. In visual case, Ethereum has more use cases. But Bitcoin is holding over 60 percent of the coinmarketcap. Many people don't like BTC for slow and transaction costs but we can use BTC on a different easy path. Ethereum can't provide us with transaction privacy.
But people still prefer to have more bitcoin over ethereum. Yes, I agree that ethereum has more use cases. But bitcoin will be the best investment that they should have. They can say bitcoin have a slow transaction cost, but no matter what, they like bitcoin.