bitcoin is techically more superior then ETH ,yes but the use cases are bigger for etheruem now!
real utility for ETH ARE BIGGER.
ETH: defi, icos, dapps, stable coins.
also the very good liquitity !!
BITCOIN ?
yes you can buy thigns with btc but so you can do with ETH.
you should know my friend, if all altcoins community become a part from bitcoin community, thats why bitcoin become more valuable than any altcoins
thats the simplest reason why bitcoin will always become the king of cryptocurrency