Personally I prefer BioBizz as I prefer to use fully organic certified products, I know they source responsibly, they're well available for me and their product lines aren't too confusing or plentiful., and by now I'm just so used to them that with their products I know better what I'm doing. That being said, Plagron also does a great job and I've seen amazing results with it too. It really just comes down to preference and grow style. If I were to go hydro instead of soil, I would probably consider Plagron products, but BioBizz is great for organic soil.