That depends on the investor, and on the kind of investment they would like to invest in. There are new coins that are worth more to invest in than the old coins due to their total supply, the teams behind the project, their roadmap, and the use-case of the project. Same as an old coin to a new coin when compared to one another.
I believe every coin has its potential, and it depends on the investor to go on with the one they have researched, not to be a scam at the end of their investment. Because someone can have the mindset of investing in old coins, they later lose their money to a project that is long gone in the crypto market. Someone can also experience the same in a new coin, to lose their investment.
To stay safe, invest in coins (new or old), after you have thoroughly researched on them