I can imagine it must be an absolute minefield out there for you, it must be so hard for new techs to find good and reputable information in order to make an informed choice of where they want to spend their hard earned money.
I am not going to recommend any brand to be honest, as it's all very personal, and I am getting rather tired of these threads of "what is the best x" (this isn't a personal dig at you, but at what kind of questions tend to ask)
What I am instead going to do is advice you to sit down and make a list of things your new brand must have, or items that are important to you and your business. For example, for me I look for a brand that offers education and training, has a full range of products from prep to removal products, will provide me with SDS documentation etc etc. (my list is rather long)
However, this is what I look for, you need to decide what is important to you.
Another thing that appears to be putting a few techs off is the price of a product. When looking at costs, rather than seeing any product purchase as an "expenses" see it as an investment and calculate your ROI (return on investment). You need to calculate the price per service and how much investment this single bottle of gel polish will bring back in return, then the price of the various gel polish brands actually don't turn out to be much different.
Don't simply take other people's advice, your business is yours and only you can make it into what you want.