Both of them can be on top just as how it is today but BTC stands out. Sooner there will be a big player that is coming and you can see it below the listing. EOS is maturing enough to support projects under its wings and its has slowly increasing in numbers. EOS will soon dominate and you might see some threads about BTC vs EOS or ETH vs EOS soon because of it.
Bitcoin and ethereum are enough to have a name in the crypto world and there are certainly many supporters of these two coins. But bitcoin is still superior and it seems the eth platform is soon shifting to the EOS platform. Gradually the position of eth will be replaced, so the team and eth holders will definitely maintain this position.