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Assuming you were completely illiterate it would VASTLY limit your interaction with the current world and ability to work than having no legs.
I am not even sure it is a contest here. Having no legs would absolutely limit my physical mobility but there are accommodations and workarounds for that. I can 100% do my current desk job with no legs, play online games etc.
Being completely illiterate would heavily isolate you and your ability to grow and learn. You would have to be verbally / visually be taught everything yet somehow not ever learn how to read or write?
I think the impact would be lessened with things like Alexa and Siri capable of translating speech to text.
You clearly haven't tried to use them for any significant task, the error rate gets bad. Hell I just use Siri for my shopping list and have to figure out some of the random garbage it inserts.
At the very least READING works well but speech to text is very hit and miss. You also can't use it everywhere.
As far as communication goes it would be similar to being blind but not knowing braille or Tactile signing and being 100% dependant on technical aids.
You're correct I don't use them but I do know several people who might be straddling the illiteracy line and use them almost exclusively. It does result in errors but it also opens many doors that wouldn't be available without it. The reverse is also beneficial as it allows these people to have text read aloud to them.
The ChatGPT app uses the speech-to-text model Whisper, and it's always spot on in English. Whisper is open source. I don't understand why it's not widespread, but hopefully it will be or similarly capable software will be soon.