The decision is usually made by the floor, not by the specification. A wheeled base like the G2 is stable and never has to solve balance, but it needs a flat, continuous surface and cannot manage a step. A bipedal platform like the A2 Ultra or the A3 handles thresholds, ramps and mixed terrain, and pays for it in runtime. All three publish a payload per arm: 5 kg for the G2 and the A3, about 2 kg for the A2 Ultra. Read them with their sources in mind. The G2's comes from AGIBOT's own parameter sheet, as does the A2 Ultra's; the A3's is a reseller figure and we hold no manufacturer table for that model, so it is the one to have confirmed before a job is planned around it.
- Degrees of freedom is the number worth reading carefully.
- The X2 Basic has 25 and no LiDAR or depth camera; the X2 Ultra has 30 plus 3D LiDAR, RGB-D and a docking station. That gap is the difference between a platform that performs a scripted interaction and one that can locate itself and a part without help. If the task involves finding something that moves, the sensing matters more than the joint count.
- For manipulation, compare reach and torque rather than height.
- The A3 publishes 320 Nm peak joint torque and 5 kg per arm with an actuator fitted; the A2 Ultra runs 40 active degrees of freedom with a six-DoF dexterous hand. Both are full-size, and they are aimed at different problems.
- Runtime decides shift patterns.
- The A3 publishes up to 10 hours with hot-swap packs; the A2 Ultra publishes roughly 3 hours standing and 1.5 hours or more walking. A platform that cannot cover a shift needs either a swap routine or a charging window designed into the process, and that is a layout decision, not a purchasing one.
If none of this resolves it, that is the normal outcome, and it is what a proof of concept is for: one task, on your floor, measured. We would rather tell you a robot is the wrong tool for a process than sell you one that proves it slowly.