I have three 6x9 cameras and I love all of them. One is a Moskva-5 -- coupled rangefinder, f/3.5 Tessar copy (coated), everything works except the latch that keeps the back closed, and friction does hold it shut (and I keep it in the everready case for insurance). On a tripod, it'll deliver images that are sharp into the 16x20 enlargement range easily. Mine cost $72, shipped from Ukraine, including a 6x6 format mask, and when it arrived appeared to have been freshly serviced.
The second is a 1928 or older Voigtlander Rollfilmkamera -- 6x9 only, unit focusing Skopar f/4.5, uncoated of course. Very simply made camera, lots of obvious wear -- and much, much easier to hand hold than the Moskva; it has a waist level finder that lets me cradle the camera with my left hand while I release the shutter with my right. Scale focusing isn't a big handicap with a little practice, and I have several cameras that focus by scale (my first 35 mm was scale focus, a well-used Pony 135 around 1972). The only way to tell the negatives from those made in the Moskva is to check for rounded or square corners on the mask.
Third one is currently waiting for verification that bellows repair was successful -- a Wirgin Auta 6.3, front-element scale focus with Wirgin Gewironar f/6.3 (coated triplet) in a cheap Vario shutter (T, B, 25-50-100) and compact folding frame finder; with 6x4.5 format masks. Before the bellows leaks got too obtrusive, it was my favorite walking around camera. The most compact 6x9 folder I've seen, this one fits in a coat pocket and is not much over half the volume of the Moskva -- it's both thinner and less tall, though not significantly narrower (6x9 and two 120 spools has a minimum size). And the images are great -- the lens isn't fast enough to get soft wide open; f/6.3 is still in the good range even for a Cooke Triplet design. It's light, easy to hold steady, reasonably quick to operate, and I really like the ability to shoot 6x4.5 and get 16 on a 120 roll with the 105 mm lens. It was my favorite -- hopefully will be again when the bellows repair has been confirmed.
Of the three, the Moskva is the best camera, technically -- but I have no plans to give any of them up.
Oh, yeah -- the Rollfilmkamera came to me in trade for a lens and shutter that cost $10 plus my labor cleaning and unjamming the shutter; the Wirgin cost $10 plus shipping.