In the realm of large software projects, the choice between a monolithic repository and several distributed repositories presents significant trade-offs that can impact development efficiency, collaboration, and maintainability. Monolithic repositories, while offering centralized management and streamlined dependency handling, can become unwieldy as project size increases. Conversely, distributed repositories provide modularity and flexibility but may lead to challenges in integration and version control. This presentation will delve into the ongoing research conducted by Sandia National Laboratories, where researchers are exploring innovative solutions to harness the strengths of both repository models through the use of Spack, a package manager designed for scientific computing. We will outline the methodology employed in this exploration, highlighting the performance trade-offs i dentified thus far, including aspects such as build times, dependency resolution, and ease of collaboration. Attendees will gain insights into the implications of repository structure on software development practices and the potential for hybrid approaches to optimize project outcomes.