Amaloco is/was a well-established brand, just more local (Germany and surroundings) than big brands like Ilford & Kodak. They were in the business for many decades. Until 2008 Amaloco was a proper business and produced at their own plant; presently, the manufacturing is done by a contract manufacturer for the brand owner Nordfoto Versand. I guess/assume that Adox is the actual manufacturer, but I'm sure someone will come along to provide a definitive answer.
Fix is fix and wetting agent is wetting agent. These are generally no-fuss, straightforward products and I wouldn't (and in fact never have) hesitate switching from one brand to the next for whatever reason.