You can't wear it with a backpack, the shakedry that is. The gore fabric is not durable.
The rain jacket is a multi-layer construction with a membrane in the middle but a more traditional feeling woven fabric on the outside. It is more durable but may need reproofing in the future to maintain breathability (the membrane will keep it waterproof regardless).
The shakedry is thinner so packs down smaller and is lighter.
As far as I have experienced, the shakedry fabric is the most breathable waterproof fabric on the market. I haven't tried the newer rain jacket.
You can't wear it with a backpack, the shakedry that is. The gore fabric is not durable.
The rain jacket is a multi-layer construction with a membrane in the middle but a more traditional feeling woven fabric on the outside. It is more durable but may need reproofing in the future to maintain breathability (the membrane will keep it waterproof regardless).
The shakedry is thinner so packs down smaller and is lighter.
As far as I have experienced, the shakedry fabric is the most breathable waterproof fabric on the market. I haven't tried the newer rain jacket.