If we stay away from all kinds of ponzi schemes like scam ICOs, then swinging btc and alts would be best. When btc has news to grow, buy btc, when btc is about to have a correction, buy alts. Rinse and repeat.
Even swinging BTC and ALTS can also be a very crazy way to lose your funds, if you do not know how to time them well, and swing them right. We have had situations where so many people out of impatience, panic and inability to make quality trading decisions have ended up loosing so much of their funds. Also, not all ICOs are scams as we still have so many of them that can give you a good profit, but you just have to know how to do your proper research and know where you are putting your funds first.