I went with both AC Delco and Gate in the past for Japanese cars and both worked fine for the recommended duration. I do replace all the water pumps and tensioners rather than inspect / replace as need, with Gate / AC Delco / etc.
I think these rubbers are old technologies that every reputable brand should know what they are doing already and not much of a risk, as long as you replace them on time.
I think these rubbers are old technologies that every reputable brand should know what they are doing already and not much of a risk, as long as you replace them on time.