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Hi from Just Answer. I'm PDtax, and can assist.
SSDI benefits are typically larger payouts, but much more difficult to earn. SSDI is paid as if you retired, and you drew a full social security benefit. SSI is low income support, and is $733 or so for a single person in 2015.
Most social security payouts at full retirement age are nearly twice the $733 SSI benefit, so you would be doing much better drawing a disability pension.
Thanks for asking at Just Answer. Positive feedback is appreciated. I'm PDtax.