My favorite oat milk is Oatly Barista, the best soy milk I’ve tried is from Joya, but I haven’t seen it outside of Austria yet. Alpro is quite good and more widely available (at least in Europe). In North America, Silk seems to be great from what I’ve heard. Store brand soy milks tend to taste pretty bad from my experience here in Germany, but some of them might have improved since I tried them years ago.