Question

Why would a deferred annuity or annuities due be preferred as a retirement investment?

Answer 1

One reason a deferred annuity or annuities would be preferred as a retirement investment is the tax deferred nature. 

Answer 2

I believe the answer is: The tax deferred nature.

Investment is considered to has tax deferred nature if the tax payment for the investment can be made years later after its due. This favoured as a retirement plan because it make the investors have more money to spend during the productive years prior to retirement.