Close call. S1 and M1 trade wins across the matrix.
Readiness, uptime, navigation & connectivity
Price accessibility and ROI clarity
Payload, speed, runtime & labor replacement
Environment fit, footprint & long-term upside
Research labs testing whole-body imitation learning and mobile manipulation under controlled conditions
Heavy parts assembly in automotive or appliance manufacturing where human-scale bipedal access to elevated worktables is required
If immediate deployment is the priority, choose S1. If the goal is to be ready when M1's capabilities mature, track it.