I'm a little late to the party to give feed back to Capt Eddie on his purchase, but maybe future thread readers will find this useful...
I have the Tin Cloth Field Jacket and the full sleeve zip-in Mackinaw Wool Jacket. I purchased the field jacket because I wanted a durable coat for working around the property, camping, walking dogs in fields, off-roading, and other similar activities. My field jacket is my general 'go-to' coat and I often just leave it in the truck so I have it when I need it. It has definitely met my requirements.
Waxed Tin Cloth transmits cold, and it is a very heavy fabric. So, the wool zip-in is great for temperatures 30F and below because it adds insulation to the shoulders. For very cold weather (0F and lower) I definitely layer with some type of zip neck first layer and a bunting/fleece pullover under the wool and jacket. I have used a down jacket under the field jacket in place of the wool, but the weight of the tin cloth compresses the down so it doesn't provide full insulation at the shoulders.
I don't think the tin cloth is the best choice for high exertion activities or where weight is important. There are much better solutions for backpacking, back-country skiing, ... But those fabrics don't last long for me when working in dirty conditions (fences, laying under a truck, cutting wood, ...).
So, like many questions on this forum, once you define how the coat will be used it will be easier to decide if waxed tin cloth and wool is the 'best' choice.