It is better to invest in old coin coins that are in the top market cap because new coins are less convincing. You also have to trade in a place that is really crowded with market activity, the volume movements will definitely be more active.
It's still best to invest with projects that already have working products, those coins which included to top coins inside CMC, looking for long term investment, those coins can work and achieved slow rise, enough to give good position to your investment with much lesser stress when things is
not working good coming inside the entire industry, you entrust your future financial success with projects that continue progressing and working more
in terms of providing updates.