There are a lot of ways to skin the same cat, as have been mentioned above. I have 9kilts, of which one is a 16 ox 6 yd casual, one is a 13 oz PV 8yd, 2 are 13oz tanks, and the rest are 16oz tanks. The biggest difference I notice in temperature issues is that the casual kilt is the coolest but less attractive because of lesser yardage, the PV is next coolest but the least attractive overall despite the yardage (I think it is the fabric and construction) , and although I can tell the difference between the 13 and 16 oz kilts by fabric feel and weight, they are virtually identical in all other ways, including temperature wearability. The swish effect is definitely better with the tanks, regardless of the weight of the fabric.

Some tartans are only available in one wool tartan weight, while others are available in various weights of wool as well as either PV or acryllic. Personally I avoid acryllic for fire safety reasons. Otherwise I personally recommend the wool, in either weight, and a full 8yd kilt for looks and wearability in the long term. Alternatively, wool in a box pleat or casual.