in my opinion the best way to buy altcoins is during private sale or pre sale but if you are afraid of experiencing losses you should wait for token until listing and buying when bounty hunter or investor sells bonus they get
however I see it this way seems wrong. buying new coins is very risky whether it's at ico or new listings. so this is not the best time to buy.
I personally the best time is when the market starts to grow. when did it start? when all the coins start green, maybe this sounds like we're just FOMO, that's crypto. those who fail are those who bought the last and started at the beginning.