Immersive videos (IVs) provide 360° environments that create a strong sense of presence and spatial exploration. Unlike traditional videos, IVs distribute information across multiple directions, making comparison cognitively demanding and highly dependent on interaction techniques. With the growing adoption of IVs, effective comparison techniques have become an essential yet underexplored area of research. Inspired by the "sliding" concept in 2D media comparison, we integrate two established comparison strategies from the literature--toggle and side-by-side--to support IV comparison with greater flexibility. For an in-depth understanding of different strategies, we adapt and implement five IV comparison techniques across VR and 2D environments: SlideInVR, ToggleInVR, SlideIn2D, ToggleIn2D, and SideBySideIn2D. We then conduct a user study (N=20) to examine how these techniques shape users' perceptions, strategies, and workflows. Our findings provide empirical insights into the strengths and limitations of each technique, underscoring the need to switch between comparison approaches across scenarios. Notably, participants consistently rate SlideInVR and SlideIn2D as the most flexible and favorite methods for IV comparison.

翻译：沉浸式视频（IVs）提供360°全景环境，能营造强烈的临场感与空间探索体验。与传统视频不同，IVs将信息分布于多个方向，使得视频比较过程对认知要求更高，且高度依赖交互技术。随着IVs的日益普及，有效的比较技术已成为一个重要却尚未充分探索的研究领域。受二维媒体比较中"滑动"概念的启发，我们整合了文献中两种成熟的比较策略——切换式与并排式——以更灵活地支持IV比较。为深入理解不同策略，我们在VR与二维环境中适配并实现了五种IV比较技术：SlideInVR、ToggleInVR、SlideIn2D、ToggleIn2D及SideBySideIn2D。随后通过用户研究（N=20）系统考察这些技术如何影响用户的感知模式、策略选择与工作流程。研究结果从实证角度揭示了各技术的优势与局限，强调了跨场景切换比较方法的必要性。值得注意的是，参与者一致将SlideInVR与SlideIn2D评为最灵活且最受青睐的IV比较方法。