If there are doubts about which coin to invest in, you can see where large companies such as Grayscale invest. Their open-to-all portfolio shows that big business invests not only in bitcoin -
https://grayscale.com/products/ But with all the variety of different coins in the portfolio, the largest percentage is allocated to bitcoin.
agreed with this statement, these large companies are investing with proper research, so if someone are doubtful in regards of their portfolio holdings then they should seek inspiration from these large companies portfolio and see how much they allocated in certain coin and how they diversify.
I'd say it's always good to have these large companies as a reference even though most of the time their investments only suited for long term.
Yes, as a rule, such large companies investing in cryptocurrencies have a large staff of employees who can really correctly assess the prospects of any cryptocurrency. And such a level of analysis cannot be compared with the knowledge of a beginner, so you can safely follow such companies, as it is safer than your own DYOR.