Availability is going to be your limiting factor. Unfortunately, most of what is available is going to be Yugo or Romanian. Of the two, the Yugos are machined better and just feel more solid. Regardless, either will function perfectly.
If you do not limit yourself to newly available and are willing to buy used, you can get some really nice underfolders like Polish, Chinese, Hungarian, and Bulgarian. There are some very nice, but rare, Russian and East German undefolders out there but they will command premium prices.
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