ethereum I think, because currently these two coins are very tight in the competition, although still far apart price but ethereum much in demand by the community wherever this time
ETH is now much more convenient and faster than bitcoin. But this does not make it very expensive, because bitcoin took the role of king. Even if the price of bitcoin goes down, you can be sure that soon it will go up again
I completely agree with you on the speed of transactions and the demand for the etherium everywhere comma that's just with Bitcoin a lot of users want to deal with. You can even buy some things with Bitcoin, not with the etherium.