It is very important that listing of tokens will be on big exchange with good liquidity that price of the tokens will be good and volumes of trade will be big.
For me the good price is the price that is higher then the nominal price that it was during token sale.
Unfortunately very often after start of the listing on the exchanges the price of the tokens a smaller then the nominal price.
Now cryptocurrency market raise. May be the price of the tokens will raise too. But a lot of depends from the project.
I think that now the situation is different that in was in 2017. In 2017 raise the price for all the tokens. Now raise the price only for very good tokens that are in demand.