In my experience, you can't really tell how well the saddle is working until after a month on tour. (If you can tell earlier than that, then you probably didn't use your saddle enough before the tour.) Your experiences training for a tour are useful, but the tour itself, with day after day of 60 miles or more, is much more demanding than your training will ever be.
Maybe I am just weird in this regard, but I can happily tour on most saddles except really very bad ones. All the saddles that came with my bikes have been fine. I never had one get worse after a month on tour. On the other hand I have had a few saddles that felt bad for the first several hundred miles until my butt broke in to them.
To the OP, I suggest using what ever you currently ride on unless it isn't working. If you need to change I like a normal road bike saddle rather than a special touring design. The Prologo Kappa (model name corrected, I had it wrong when I posted) is what I put on the last bike I built up and it is pretty comfortable for me.