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.