Hard to say. The market has moved up my favorites. I used to like Dash, EOS, and NAV, but since all have gone up huge in value, the best is kind of a relative thing.
Steem has the lowest downside still. EOS, Dash, NAV coin could all go down 50% if someone buys them today. Steem is unlikely to trade back below 1.75 in my opinion. So in terms of loss-protection Steem is nice even if the upside is not huge.
In terms of what could go up really big in the future... BTC at 10k (if it goes back there), I would buy it there. Seems silly but now that it's broke 10k, BTC is worth more due to the hype this has created. It's odd but true, that the higher in value it goes, the more it is worth due to the hype marketing created by it going up. If we see 50% declines in Dash, EOS, or NAV they are all buys there.
We may not get those declines soon, and the market may continue higher, though.