Question about AVM FRITZ!Box 7590 AX International

Somehow it is not really comprehensible to me what the differences between the Edition A/CH and International models really are. Personally, I would have opted for the Edition A/CH based on the description, as it is apparently tailored for use in Switzerland. However, reading the comments, the International model seems to be the better choice, at least the telephony works via Swisscom or UPC/Sunrise. However, I don't know whether this is also the case with the Model Edition A/CH. I just want to be on the "safe side", it looks like you can't go wrong with the Model International, right?