Hey Sconnie,
I'm one of the CSA employees over at Armada so I can definitely help shed some insight on those jackets. The Sherwin jacket length in size large from your shoulder to the bottom hem is approximately 33 5/8". The XL size is about 1 to 2" longer. It definitely fits taller than the Balfour. I'm around 5ft 10" and the size large is pretty close to mid-thigh. The Sherwin Jacket is definitely a hardshell so you'll want to layer a hoodie or tech. layer underneath or you'll get pretty cold skiing at the resort. It is perfect as a resort/touring jacket.
The Atka Jacket fits pretty true to size similar to the Sherwin but it is 1 inch longer in length. The XL Atka jacket will be around 35 5/8" in length. If you have a tape measure, you can check and see if that length looks good for you. The Atka has warm insulation so it will work great as a daily resort skiing jacket.
If you have any other questions about sizing or anything shoot me an email at kolton.smith@armadaskis.com