It seems to me that BTC and Ethereum thank their growth prospects to their established names, rather than the tech behind it.
If you think it's different, let me know.
but I think it's only natural that bitcoin and ethereum go up in its name and are said to be the pinnacle of crypto coins. Bitcoin and etheruem have an age that is not much different from the current crypto. because over several generations these two coins are indeed very strong hold true to their name and the community that supports them behind it. Ethereum is growing with its great technology, bitcoin is famous wherever we are.