How much wear?
IF it is just a little wear on the high points, you might just leave it alone. Or refinish the one with the most wear. I don't see a reblue affecting the value of a model ten that much, as they are not rare collectables or anything. On a common gun like that, I would expect that the quality of the refinish would have the most impact on the value. If there is pitting, deep scratches, etc., and they just buff over that so that it shows thru the new blue, that makes me pass on a purchase. If it is just a little wear, that is inconsequential, unless the front sight is shiny bare metal. You could touch that up with cold blue or a black paint. IF they were say, prewar M&P models, I might say do not refinish at all. Otherwise modern 10's are common and maybe if you want to customize one with a matte blue, custom grips, etc, no big deal. If the job looks good afterwards.