Bitcoin is a very popular coin that has the highest price, but it is better to buy only the underestimated coins which have the potential for growth in the future. Recently, the price has decreased for such well-known coins as Ethereum, Ripple and IOTA, so now the purchase of these coins is expedient and promising.
In this turmoil I would also advice to stay with established cryptos that have an existing product and community. Most smallcaps got wrecked this year and the bloodbath is not over yet