It really depends if the remix is good or not. You can't really say one is better than another because some can be bad and some can be good in both options.
If I hear the original version first, the remix will make me sick and, if the remix is bad enough, could ruin the song for me altogether.
If, however, I am to hear the remixed version before the original, I'll get used to that one, and the original version will just sound bare and simple.
