All the tokens will have more value if you keep it for a longer time,there is no such thing as the best tokens because tokens are called tokens because the project is still in an ICO phase which requires the developers to raise some funds to pursue the development of the project,if the ICO has reached softcap or hardcap surely the value of these tokens will grow in the near future,so you should hold these ICO tokens if they reached atleast the softcap.