IMHO, I believe if you have enough money or capital to invest in bitcoin well thats the best thing to do because Bitcoin is the most popular and most attractive cryptocurrency to invest in right now, Just think and considered that Bitcoin is already a trillion-dollar market cap plus more and more mainstream businesses are joining into the Bitcoin bandwagon, and the most popular one is the Elon Musk company called Tesla so for me it is a good decision to invest in Bitcoin while picked Ethereum as a backup investment but just focus on Bitcoin.