I would imagine that the details would be less than in the balanced mode but maybe the same as in the resolution mode. See:
XBOX UPDATES
Optimized for Xbox Series X|S Enhancements
Added “Preferred Mode” graphics option which allows switching between three different presets: “Resolution”, “Balanced”, “Framerate”. These modes adjust video settings to bias towards image quality, resolution, and framerate.
- “Resolution” : This mode prefers higher-resolution output at the cost of some image-quality (Series X: 4K @ 60Hz, Series S: 1440p @ 60Hz)
- “Balanced” : This mode prefers image-quality at the cost of resolution (Series X: 1440p @ 60Hz, Series S: 1080p @ 60Hz)
- “Framerate” : This mode prefers higher frame-rate at 120 frames-per-second at the cost of both image-quality and resolution (Series X: 1440p @ 120Hz, Series S: 1080p @ 120Hz)
- NOTE: Not you must have a TV that supports 120Hz or VRR (Variable-Refresh-Rate) to fully take advantage of the “Framerate” mode