I received two different 1099-R forms. how do i know which one i use?

[MichaelL1]

Unless one is a corrected 1099R you will need to enter each one into TurboTax.  I is similar to having more than one W-2.  All need to be entered.  If you belive one is incorrect, then contact the issuer of the 1099R and ask them about it.