DROID is indexed with Teleoperation, RGB-D, Proprioception; ALOHA is indexed with Teleoperation, RGB-D, Proprioception. That difference matters because modalities decide what a model can learn directly. Video-only data can help representation learning, but it may not support action-conditioned imitation. Proprioception can help policy learning, but only when it aligns with observations and task boundaries. Point clouds or RGB-D can help geometry, but only when calibration and coordinate frames are usable.
The format comparison is DROID: HDF5, JSON, MP4; ALOHA: HDF5, MP4, JSON. Format names should be read as loader hints, not quality guarantees. The buyer should still test whether files open, timestamps are aligned, units are consistent, labels are meaningful, and conversion into the target schema preserves the fields needed by training and evaluation.
The buyer should run the same sample script against both datasets. That script should report accepted sample count, parse failures, missing fields, corrupted media, episode duration, action/state coverage, timestamp issues, and metadata completeness. A comparison that does not include a sample script is only an editorial opinion. A comparison with a repeatable sample script becomes an engineering decision.
If neither dataset can pass the sample gate cleanly, that is not a failure of the comparison. It is a useful procurement result. The buyer can then turn the best properties of both sources into a custom bounty: the desired modalities, file structure, consent artifacts, task coverage, and acceptance criteria, with no ambiguity about the target deployment distribution.