I think if you want to invest then both of these coins have a pretty good prospect in the future either bitcoin or ETH, because these two coins both have a very large market power and have a very high market enthusiasts.
if for a period of time will probably have a long time if investing in BITCOIN because now the high bitcoin price but if you are patient waiting then the profit will get big enough too.
one thing to note in investing in bitcoin or eth is patience and capital. if you have a large capital then it will get a big profit in a short time in every bitcoin or ETH price increase