there is no need to debate anymore, because I will definitely choose Bitcoin and I am sure that most people will also choose to invest in Bitcoin too, because the risk is smaller than investing in Altcoin and Bitcoin will definitely give me a profit, because the price of Bitcoin always create a new ATH price every bull runs happen.
Bitcoin will only be the main investment, but for some backup investments or for Altcoin investment I will choose ETH, SOL, MATIC, and DOGE, but other altcoins are not included by OP such as BNB and LTC. Bitcoin ATH is always anticipated, when Bitcoin is bullish and sideways, then there is a good chance for altcoins to recover and head for altcoin season. Not only Bitcoin investments, altcoins will also be profitable if you choose the best.
Yes we always have to invest in some coins from altcoins besides Bitcoin. I have invested more in Bitcoin and choose bnb and ETH from altcoins. Because I think investing in these coins never has a chance of loss.If the price of the coins dump after investing, then if we wait for a long time, we can recover our loss very soon. When the price of Bitcoin increases, then all altcoins will start increasing in price.
Investing in several altcoins should be done, because you can avoid losses, especially with large capital,
of course the risk is also big, but if you diversify your assets, profits will continue to flow, with a capital of $ 40k,
you should buy 6 to 10 cryptocurrencies , because currently it is still bearish and very suitable for investment.