What are main differences ?
I think the cameras are quite similar.
Main differences are
- movements:
SWD-II: Shift rise/fall/left/right each 17mm ->
http://www.horsemanusa.com/digital/img3/SWD2_mv.jpgWRS1000: 20mm left/right, 15mm rise and 25mm fall
So the WRS1000 allows extended movements.
Especially the 25mm fall are fine for architecture. At 25mm you will lose significantly sharpness... but if there is just the sky in the scene (e.g. above a building) you don't need that much sharpness at 25mm shift. And if the building itlself ends somewhere between 15mm and 20mm shift that will be fine (reasonable explained?).
- handling:
SWD-II: lock-knobs to adjust the back. If you unlock the back you move it free with your hands.
This is a bit loose for me personally - but it's extremely fast!
WRS1000: all movements are done with fine adjusting screws. Smoother to adjust but slower.
Both have individual lens panels. But I think you can use all the digital Schneider and Rodenstock on both cameras (on the WRS you can).
If you want to use Rodenstock you should use the HR lenses. Resolution of the non-HR lenses does not match the P45 with its 6.8microns pixels (at least the Apo Sironar Digital 35 I checked was poor at the edges).
The HR are probably the superior lenses compared to the Schneider Digitar. But according to the smaller image circle movements are limited (but still give something around 12 or 14mm shift wide open... search for post of "rainer_v").
Nevertheless, the Schneider match the resolution of the P45 very well - with shift up to 18mm and even 20mm they still hold edge sharpness good enough (at least the 47XL does).
So I think with regard to highest IQ go for the HR, with regard to still very high IQ but wider movements go for the Schneider. Too, there is the price to consider.