No one will notice if your stands are different brands. Almost no one will notice the same of your cymbals. That being said, why not match? They're all great. They all make exactly what you are going for. They are all priced competitively. The only reason to mix is if you are on a budget and buying used. This applies to stands and cymbals for me. Snares are another animal. Matching a snare at the sacrifice of sound would be idiocy. Same with pedals, use the one that feels best for you (and no one sees those anyway). In a blind test who cares, but playing live is a visual thing too. When you go to a concert the gear is impeccable. It's part of the illusion. You don't expect or want to see the drums look like something from a pawn shop. That illusion is not exclusive to top acts. You can do it too. So unless you are strapped for cash (been there) make them match. If you have the money there is no reason not too.