Personally, I would make my choose evaluating the overall condition of the sword: better a good, healty showato with quality koshirae than a (maybe) gendaito out of polish and with battered fittings...
Unless you find a very appreciated swordsmith, worthing the expensive polish of the blade, but it appears not to be the case.
If you can provide some pics of the "candidates", it will be easy to judicate.