Billy Markus, co-creator of Dogecoin, recently shared his top five cryptocurrencies: Dogecoin, Bitcoin, Avalanche, Ethereum, and Solana, while expressing skepticism about XRP, which he does not own. He highlighted Ethereum's high gas fees and praised Avalanche for its real-world applications. Despite XRP's growing interest due to the anticipated Ripple stablecoin and ongoing legal battles with the SEC, Markus remains indifferent to it.