That's an interesting choice. I wouldn't buy any of them, but if I had to I'd pick DOGE. XRP is a centralized coin that is worth nothing. DOGE at least funny and decentralized.
No bad fun here XRP and Dogecoin are two very popular coins. If I had enough money to invest I would definitely invest something in both of these coins. But I always believe that all these coins will occupy good position in future. Maybe many people may not like these two coins but these two coins are very popular for me.