My advice isn't to immediately change gel brands. It might not be what you want to hear, but changing brands is expensive and if you experienced breaks then it might not be the fault of the product. I use and really like Lilly Nails, and have used Light Elegance. They both have different gels of different viscosity that are suited for the various lengths. I use Lilly Nails Clear Fiber for everything from short to long lengths. I've used young nails too (though I use Lilly Nails full time) and never experienced a break with them either, even though I do a lot of long sets. It could be that you were not using their correct gel for the length, since young nails have many different viscosity gels for different purposes. If the nail is built properly, and the client has an activity level suitable for the length, then in theory they shouldn't break even if they were made with a low quality product (which young nails is not). Instead of jumping from brand to brand, which gets crazy expensive to do, perhaps have a look at what caused the breakage in the first place. Was the apex done correctly, was the C curve deep enough, maybe the sides were filed to thin near the stress area where the finger ends, perhaps the client asked for a length she couldn't handle, maybe the viscosity you used was best suited for salon length or medium length, or maybe (if you're using tips) they are not blended correctly, or maybe you should consider using forms on the clients who want long nails (if you're using tips currently, that is) .
If there are many reasons as to why you're considering changing brands and not just you feel they break easily, then I'd like to recommend Lilly Nails or Light Elegance. Both are great quality, Cruelty free and hypo allergenic. They also both offer a good range of gels in different shades, viscosity and purpose. Light elegance is slightly pricier, but their gel range is larger and their glitter gels are known worldwide and gorgeous. I would still advise you to look at why the breaks occurred though. If you're experiencing breaks with young nails, there's no reason why another brand would immediately work better for you. Good luck!