Which is best XRP or XLM?

Could you please clarify for me which cryptocurrency is superior, XRP or XLM? I'm trying to understand the distinct features and potential benefits of each. Could you break down their respective functionalities, scalability, and security measures? Also, could you provide insights into their use cases, especially in terms of cross-border payments and remittance? Furthermore, how do their prices compare and what are the predictions for their future growth? It would be helpful if you could also mention any risks or challenges associated with investing in either of these cryptocurrencies. Thank you for your assistance in this matter.