Ico is some risky thing. so better try to invest in bitcoin or altcoin. bitcoin is such profitable though need too think before invest. but you can invest in small altcoin. small amount in bitcoin.
If you need to choose only one of these options, I would better stop at altcoins. I will explain why I do not pick Bitcoin or an ICO. ICOs are too risky, while BTC price does not grow fast. With alts, you have more chances to get profits in a short period.