I don't trust new altcoins, they are mostly built by scammers, I wish people can start investing in projects that are already on top ranks on coinmarketcap, they are less risky and active than most new projects that will turn scam later, if I have to trust any it will be a project that was announced by top exchanges like binance
Depend on the market trend because if that coin is of great interest and the development team always has a lot of outstanding news, it will surely attract a lot of big investors. I prefer to invest in newer coins because it yields huge profits if you are lucky and of course, the risk will be very high compared to the coins available in this market so please consider when deciding.