welcome to salon geek!
couple of suggestions:
firsly; could you please fill in your profile with some more information: what brands/products you use, what services you offer, what training you have - this will help geeks offer more directed advice
secondly; when planning to pose a question, try the search function first - you may find that your question has been asked hundreds of times before and may not need to be asked again...
Back to your original question - the consensus from numerous threads is: the brand you know and trust is the best for polish and strengtheners... If you have been taught how to get the best from it and you/ your clients love it then you're on to a winner...
do a search and you will find reviews and opinions on every polish and nail strengthener under the sun...
hth's