Great question, RunCarla -- My real test in life is to wear the garment for its intended purpose.
I wore the Banana Republic silk elbow length in navy to work. It met every one of my intended purposes. It felt dressier than a plan tee shirt. The color was rich. It coordinated perfectly with white jeans. The fabric was light weight (but not tissue weight) on my body and oh so soft. And I loved the very slight fitting. There does not have to a lot of fitting to elevate it above an ordinary tee shirt. Although I haven't washed it yet, I do recommend it.
The linen is a lot heavier (not yet worn). I am not concerned about it being heavier because my experience has taught me that linen really does breath well in my climate. I like the added interest of the stripes.
I have yet to wear the landsend. I can tell you that it is a nice cotton and soft. It might have been a bit shorter in body length than the Banana Republic. I can't swear to that, it was something in the back of my mind.
So in summary Banana Republic for the win!!!