I prefer old coins with strong fundamentals to invest in when the market is down. new coins run the risk of being useless, unvaluable and difficult to recover. we see how many coins in the pancake lose their value even die.
Old coins with low volume is not advisable, there is no profit investing on that coin because it will just move its price a little pump and a little dump maybe you are just going to lose your transaction fee investing on it. I am into new coin just make sure to invest in new coin with use case, there is a big chance that you can earn from that specially when it get listed to a big exchange.