What is the best cross-chain crypto?

In the ever-evolving landscape of cryptocurrencies, the quest for the best cross-chain crypto solution has become increasingly relevant. Could you elaborate on what factors should be considered in determining the optimal cross-chain crypto? Is it primarily the speed of transactions, the security of the protocol, or the ease of interoperability with other blockchains? Furthermore, are there any specific cross-chain cryptos that have emerged as leaders in the industry, based on their ability to seamlessly integrate with multiple blockchains while maintaining high performance and scalability? Clarifying these aspects would help us gain a deeper understanding of what truly constitutes the best cross-chain crypto.