I think the best plan overall would be a combination of choice in either something like the above two plans OR SS taxes being paid through the Fairtax plan.
The FairTax takes care of your issue of lower wage earners, since they would not pay any SS tax at all, which would enable them to invest the same amount, but still receive a separate SS benefit.
The FairTax takes care of your issue of lower wage earners, since they would not pay any SS tax at all, which would enable them to invest the same amount, but still receive a separate SS benefit.