When the market is res or green? I would say green... you want to have your coins when the market picks back up right?
No one will invest in ICO if their market performance is in Red because other may think that the certain ICO is losing and not a promising investments. You should wait to see them in green because it determine that the price is now going stable that the team hard works are working in which we could conclude now that many new investors are coming in. So to ensure gaining you should choose the ICO with good value trend in the market.