If this refers to general, then I will choose popular altcoins such as ethereum, BNB, and other popular altcoins. I think most people will also include popular altcoins in their portfolio, especially Ethereum.
However, if this refers to newly developed projects, I personally look at the projects currently being developed by the TON team, such as TonUP and TOT. Personally I invest there, and hope the price can be higher in the future. This is not a suggestion to invest there, but I would stress to do your research before investing in a new altcoin.