I have two Ducks, a Wonderedge and a Goldedge. Many other Solingen full hollow blades shave as well, and while the cracked ice scales look nice they are really nothing special quality wise. They seem to be available in large enough numbers that you could pick one up most anytime in the future on the secondary market. But you take your chances.
I also have a Le Grelot quarter hollow, and have had a full hollow Le Grelot that was a fantistic shaver. My impression is these NOS Le Grelot razors are limited in number and once they are gone the secondary market will be the only market.
I don't have a Dovo 41, but they have a good reputation. No idea if Dovo is making them still. Someone will chime in that knows. I can't provide any additional information on the razor.
My vote, (heck, it's your money I'm spending) would be for the Le Grelot. Good looking, even sans thumb notch, excellent shavers, and you can still purchase NOS. Plus it could be returned if suffering from TI quality control issues.
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