1. Data Model Differences: Noms utilizes a data model based on structured data, while Percona focuses on relational database management systems (RDBMS) with ACID compliance.
2. Storage Architecture: Noms uses a novel storage architecture known as M-Tree, providing efficient storage and retrieval capabilities, whereas Percona typically relies on traditional storage engines like InnoDB or MyISAM.
3. Distributed Capabilities: Noms is designed with built-in support for distributed data storage and access, enabling seamless collaboration and scalability across different nodes, whereas Percona requires additional configurations and tools for distributed setups.
4. Query Language: Noms uses its own query language called Nx. In contrast, Percona supports SQL queries, making it more familiar to users familiar with standard database languages.
5. Versioning and Change Tracking: Noms has built-in versioning and change tracking capabilities, allowing users to track data changes easily, while Percona may require additional tools or configurations for similar functionality.
6. Backup and Restore Functionality: Noms has unique backup and restore functionality that allows for efficient snapshots and recovery processes, whereas Percona relies on standard backup and restore mechanisms like mysqldump or Percona Xtrabackup.

In Summary, Noms and Percona differ in terms of data model, storage architecture, distributed capabilities, query language, versioning, and backup functionality.