I always choose the strong one because I know those altcoins will definitely bring an income to me. Today, there are many promising projects that you can see, and most of them are Defi projects. I already sell all my ripple (xrp) and the money that I got in selling my xrp, I use for buying more Bitcoin, Ethereum, and Binance coin. Right now, I  currently added a few coins in my portfolio and those are Elrond, Chromia, and Algorand (I'm not promoting these coins). But remember if you're going to invest in altcoins, always look for the potential coin that has real use cases.