In my opinion, when dealing with your hair, it is all about the technique. You can use the most expensive products and have the same outcome that you can achieve when using more inexpensive products. It is how you care for your hair that matters.
The most important thing to remember when handling your hair is to always treat it like a piece of fine silk. Never pull and rip a comb or brush through your hair. Especially when transitioning! The difference in the 2 textures make it very easy to break. Always be conscious of the line of demarcation. This is where the relaxed hair ends and the natural hair begins. This is where you may encounter the most damage and breakage when transitioning.
See how I detangle my natural hair in this video.
You want to be just as if not more careful of how you comb out and detangle your hair when transitioning. Do not comb or manipulate your hair when it is dry. That IMO is just asking for trouble and breakage. You may have heard that hair is at its weakest when wet and you should not brush wet hair. For natural hair I believe that it is the other way around.
A comb will never touch my hair without some type of moisture in it. My hair has to be either soaking wet and/or slathered with conditioner in order for a comb to glide through without causing tons of breakage.
Make sure you take your time when dealing with your hair. Never try to do your hair when you are in a rush or frustrated. Just ponytail it and come back to finish it later. You must always have the patience to take care of your hair when transitioning.
As I stated above... Its all about the technique. How you care for your hair will always give you results no matter what products you are using.