I fully support a road trip to Franklin, Matt is great and very helpful. The first question the comes to my mind is how are you going to wear the kilt? I believe, the care and feeding of a Poly/rayon kilt is easier than a wool kilt. Throw it in the washing machine, pull it out and smooth the pleats and let it dry. This is not to say that the care and feeding of a wool kilt is that difficult but it different.

Also, if you are going to wear it day after day where the chance of catching the fabric is high I would rather tear a Poly/Rayon kilt that a wool kilt.

Think about when, where, and how you will be wearing your kilt this may have some impact on which to get as your first.