Personally I use CND, but have a few Nfu.oh colours and glitters. I know a lot of techs think highly about CND, Nfu.oh, Ezflow, Nsi and probably a few more I don't remember the names of.
I know changing systems can be a challenge, so changing to a new system almost always require a new system. I can speak for myself I tried Ezflow, until recently you weren't able to train in ezflow, just buy it (anybody can still buy it) in my country. As I knew it was a high end product, I could only blame myself for the problems I had. Eventually I got it, but it took time and a lot of errors, and as I couldn't have proper training I decided to carry on with CND (just loved the glitters of ezflow).
I know there's a tutorial on product control somewhere on here, but I'm a lousy searcher, probably down to language:green: But try do a search..