Momento Cache is presented as an optimal serverless caching solution for DynamoDB, offering enhanced developer experience, scalability, and cost efficiency compared to DAX, which is criticized for its lack of serverless architecture, complex configurations, and limited support across programming languages. While DAX requires specific binaries and has limitations in scale and elasticity, Momento Cache simplifies the caching process with a single API call, supporting a seamless developer experience without the need for provisioning or maintenance windows. It is highlighted for its ability to improve latencies by up to 60% with a pay-as-you-go pricing model, thus offering a more efficient and cost-effective caching alternative that aligns with the serverless nature of DynamoDB. The text also references a blog post by Ellery Addington-White, which provides a practical example of Momento Cache's effectiveness in accelerating DynamoDB workflows.