Bitcoins of course, since bitcoins are really low right now and alts are pretty high, I think it is good to buy bitcoins and short altcoins like DOGE which is so high right now without any justification to why it is high. Next is to short those other coins that are pretty high like LTC, ETH and XRP. Though those coins are good, but I think if bitcoins suddenly pumps, those coins are going down pretty bad.