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Abstract Multilateral wells have emerged as a leading technology for maximizing hydrocarbon recovery and reservoir contact while reducing surface footprint and overall field development costs. Central to the effectiveness of multilateral completions is the integrity of the junction—the interface between the main bore and lateral branches—which directly impacts well reliability, production efficiency, and future intervention capability. Technology Advancement of Multilaterals (TAML) provides a standardized classification system for junction architecture, with TAML Level 2 and Level 4 representing two of the most frequently applied designs in the industry. TAML Level 2 features a cased and cemented main bore with open-hole laterals, offering operational simplicity, lower costs, and suitability for stable, consolidated formations. In contrast, TAML Level 4 utilizes full casing and cementing in both the main bore and laterals at the junction, delivering superior structural and zonal isolation, particularly beneficial in unconsolidated or high-risk reservoirs. Despite their widespread use, choosing between TAML Level 2 and Level 4 is far from straightforward. Each design presents unique mechanical, hydraulic, and operational trade-offs. TAML Level 2 enables faster installation and reduced execution time but may require remediation if integrity is compromised or crossflow occurs. TAML Level 4 increases up-front execution time and cost, but can reduce long-term risk, facilitate selective intervention, and support advanced completion accessories. As field development challenges intensify—including the need for enhanced selective production, improved resource recovery, and reliable future re-entry, oil and gas industry operators must rigorously assess formation properties, completion objectives, operational risks, and economic implications when selecting the optimal multilateral architecture. This paper systematically evaluates the technical and economic drivers for TAML Level 2 and Level 4 selection. It introduces a seamless framework that guides operators through the process of balancing well integrity, production targets, and cost-efficiency. By integrating geo-mechanical data, operational scenarios, and historical field performance, the framework delivers actionable insights for tailoring junction designs to diverse reservoir contexts. Ultimately, this work advances industry understanding of junction integrity in multilateral wells and presents best practices for achieving sustainable, reliable, and high-performance field developments through informed architecture selection.