They all work well I have not seen any be more effective than the next to be honest.
Thats why you go cheap with take root
What kind of medium are you pro-powder guys using? I've used rapid rooters and jiffy pellets with powders and had very poor results. When using gels with the same mediums I get close to 100% success. I think the gel seals the cut end from air preventing embolisms. I've also noticed that with the gels the stalks get all fat and lumpy wherever the gel touches them. When I see the fat lumpy stalks its always an indication that roots are about to pop out.