Yes, it absolutely better to invest on already existing coin/tokens that are doing very well on the market constantly.
What i meant by already existing coin/tokens, i am particular of some old coins which has survived several market dumps, bear runs, dips, markets corrections to date. If you take a look at the Coinmarketcap ranking, you may observed that certain coin/tokens has been consistent, like most of the first 50 coin/tokens. Many newly listed coin/tokens in recent times can not survive just one market dumps(that is, Btc dump).
There are great differences between many of the old coins and a vast majority of the newly listed coins in term of liquidity, trading volumes, marketcap, and most importantly, the possibility of continuity especially when bear run enters the market.
You may agree with me that so many coin/tokens projects has crashed or dead, but majority of the old coins like, Ada, LTC, Bch, TRX, Matic, XLM, Link, Dot, BNB, Sol etc, are still waxing stronger by the day.