Bitcoin has still great potential for growth, but in the crypto currency market one can not focus only on one crypto currency. Divide your money in the proportion of 60% of BTC and 40% of ETH.
I agree with your thoughts, Bitcoin and Ethereum are two very promising coins so it would be more profitable to choose these two coins for long-term investments because of the potential to generate big profits in the future.
Excellently I prefer to invest on Bitcoin and Ethereum that gives me more valuable and enormous profits. Both has a potential and great prospect on future. Bitcoin may one of the leading and an expensive asset while Ethereum has a great viable flatform. Also, these two asset are good for long term investment and I will assure you it is worthy to invest in this two coins.