Hello

I'd go for either the Linhof of the Sinar sizes. Sinar is nice as it is bigger but, on the other hand... it is bigger. This may not be an issue, except for portability. If you want to use BIG lenses (shutter sizes 3 and bigger), then may be Sinar would be better (but a #3 can also be used on a Linhof style lens board, if the rear element is not too big.