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.
You should diversify your investment portfolio and consider altcoins. Altcoins can offer different investment opportunities and potential returns, but it's crucial to conduct thorough research and understand the specific characteristics, use cases, and risks associated with each altcoin before investing.
As a dApp and smart contract platform, ETH has a strong development community. Solana, MATIC, and Dogecoin have also gained popularity. Polygon offers a scaling solution for Ethereum-based applications, while Solana provides scalability and fast transaction processing. As a result of its meme-inspired nature and strong community following, Dogecoin gained attention. So, before investing in an altcoin there should be research on the dev team and the fundamental value of that coin. Therefore, it's worthwhile to carefully assess the potential risks and rewards associated with investing in specific altcoins.