The question of who is better is not fair!! Both Bitcoin and Ethereum have some good features that make them superior to other coins and they also have some negatives, for example Bitcoin has the problem of block size and transaction delay in addition to the problem of electrical energy that we need for mining, but despite all that Bitcoin remains the coin The first popularity in the world and has the largest trading volume in the market in addition to being the real engine of all markets.
 Ethereum mainly suffers from network congestion and high fees but also has many other important features and DAPP applications and with the move to Proof of Stake POS will solve the problems of congestion, delays and high fees and is the second currency in the market.
Conclusion I can say that with hundreds of coins appearing that outperform Bitcoin, but Bitcoin will remain the #1 best and most popular coin of all time.