As you have a Sinar then you're aware of limitations so maybe go for the Ernemann but without to high expectations, some parts missing paneles etc you can make, the shutters trickier but not too hard to replace the curtains, the finders missing. Perhaps a longer term project.
There's plenty of other FP shutter 9x12 cameras in Europe as Goerz, Zeiss and a few others made them or there's the SLR option Mentor being an example. Usually cameras that need slight restoration are relatively inexpensive.
I'd buy that Ernemann as a learning project, if you're lucky it can be restored if not you've the knowledge to move on to other restorations.