S&B is in Czech Republic
Unis Ginex primers are from Bosnia Hertzogevina
Different Companies, different Countries, different Primers.
I have both, in pistol, but have not used them yet.
I did just prime 100 45 ACP and I really like the way the UG primers look, seated fine, and seem deformation resistant. I primed new GBW 45 ACP brass that actually looked great on arrival, all round and shiny, no burs at all (on sale at Midsouth).
I do like the Tula 556M primers and use them for all 223/5.56.
I have never had any issues, nor heard of any issues with any European primers, other than S&B being hard to seat.