In the past, I've always made cucumber bean curd salad with soy sauce. I never tried maggi sauce until a month or so ago when my mom turned me onto it. It's a super flavourful sauce that looks exactly the same as soy sauce, but IMO tastes even better. Maggi is slightly less acidic than soy sauce and works really well in this recipe. I imagine that most people are more likely to have soy sauce than maggi in their pantry, but if you do have maggi, definitely give it a go in this recipe.