MongoDB has its strengths and weaknesses when compared to Aerospike. MongoDB can be challenging to scale, particularly from a single replica set to a fully sharded environment, but it is not designed for single-node use. While MongoDB's performance may degrade with increasing users, this issue is more likely with smaller clusters or undersized nodes. However, MongoDB does not suffer from data loss and inconsistency issues like Aerospike. Additionally, MongoDB has its own caching mechanism in WiredTiger, making a third-party cache unnecessary. When deployed across multiple geographies, MongoDB can perform writes locally, unlike Aerospike which uses XDR for cross-datacenter replication. Furthermore, MongoDB has a mobile solution through the Open Source Mobile Realm, and its management is not time-consuming or difficult. However, Aerospike offers a managed service that allows users to focus on their core tasks while leaving database management to the provider. Overall, both databases have their advantages and disadvantages, and the choice between them depends on specific use cases and requirements.