Based on the current market situation, Ethereum has been on a roll with a little bit of Ripple and Stellar. As Bakkt Bitcoin futures would come in a few days from now, expect that Bitcoin will reclaim its dominance once again after seeing a glimpse of altcoins having their own "season".
But I would bet more on Ethereum and a little bit on Stellar for the long-run. It's just my own instinct anyway. Even Ripple did had some gains, I wouldn't bet on this for the long-term. However, it's good to diversify by accumulating more tokens such as NEO, Ethereum Classic, TRX and BNB.
Again, this is just my own instinct. Cheers!