True, both options under capitalism are pretty bad.

The one sole benefit to the disabled is being able to work for Goodwill for a few hours a week will be unlikely to go over their income limits so their SSI and so they can stay on SSI and still work at least a little to supplement their obscenely meager disability income. SSDI recipients fare far better and are literally allowed to have income as long as it isn't worked. Meaning a rich SSDI recipient can stop working but still make a boatload of money off of investment income.