For me the answer is obvious. Bitcoin is a more reliable value. This is happening even now. In the long run it will be even more pronounced. The mechanism of inflation underlying the Ethereum will never allow him to become promising in the long term. He's probably already reached my limit.
It can't be deniable that bitcoin is more profitable since before. This is just a long term competition, and almost of crypto community more preferable to bitcoin than ETH because of it's amazing historical records in terms of profit gaining.
Although, we can say that there us a lot of changes in there way, and I know both of them will still exist on that time. But I believe bitcoin price will be doubled as of price today. ETH still doing great but not like with bitcoin movement.