Accelerating new product development (NPD) to gain a first-mover advantage is crucial in today's competitive business landscape. This paper aims to examine the effective power structure in NPD projects through the lens of two divergent theoretical perspectives: Information Processing Theory (IPT) and Resource Dependence Theory (RDT). While IPT suggests the benefit of a balanced decision-making power among various subunits, RDT advocates for a concentrated decision power for faster consensus and efficiency. Our research specifically investigates whether a balanced or imbalanced R&D/marketing power structure is more conducive to accelerating NPD time. This focus stems from the recognition that the interplay between R&D and marketing is critical in shaping NPD outcomes, though we acknowledge the broader context of multifunctional collaboration in NPD, including aspects like manufacturing. The paper tests two competing hypotheses: one advocating a balanced R&D/marketing power structure as per IPT, and the other supporting a dominant R&D/marketing power structure in line with RDT. We surveyed project leaders, R&D, and marketing personnel from 126 NPD projects across 87 Taiwanese firms. The empirical results significantly endorse the balanced R&D/marketing power structure hypothesis, suggesting that a harmonious collaboration between these two key subunits can expedite NPD processes. Our findings contribute to both academic research and managerial practice by offering nuanced insights into optimizing power structures within NPD teams, particularly highlighting the efficacy of a balanced R&D/marketing approach in the context of the prevalent theories.