The Tetenal kit is better. I have used both, also the full kodak fuji 7 bath kits. The tetenal gives the same results as kodak fuji. No differece, just easier.
Blix works just as good as seperate bleach and fix baths, the difference being that you must use it within 2 weeks of mixing. Seperate bleach and fix is designed for continuous industrial lab usage with a replenished system. Blix is for 1,2,3 shot use then discard home processing.