Different Model Brands
Testors
Testors models always come with ample instructions. The two model kits I own of theirs follow the same format in instructions. All the painting FS numbers are given, so you can be accurate with the paint coats. The research they put into their models is shown through the plane history in the instructions. They also include reference material for your perusing. But, since this is a Testors model, all the tips included on the sheet advise using the Testors line of products. Other than that, this series is complete.
AMT ERTL
These models are the most customizable. Models from this company, in my experience, have come with multiple building options for external payload, landing gear raised or lowered, and often two different painting schemes. Their instructions are very detailed and quite large. They also included an extensive history of the plane, but I have sometimes seen it to disagree with my other references. One problem for beginning modelists with this company's models would be that all the parts (except the windows) are molded in white. You must paint thoroughly on these models.
Academy Minicraft
Although I only have one plane (the TBF Avenger) of this company, I have a few remarks on it. Their instructions have a lengthy history of the airplane. However, they use no words in the instruction on building besides paint colors. This makes the localization of the directions easier on the company, but harder on the modelist. This might be a rare incident, but I was missing two rather important pieces from this model.
Monogram/Revell
Monagram/Revell models are the most widespread model kits available. Their directions most always start out with a small history of the plane, and then many warnings/tips in different languages. Since this is such a widespread brand, many different languages are used for customers of different countries. They are not very specific with their descriptions of the paints, as they don't refer to the FS numbers. The directions themselves have not many words, but use arrows and such. They are sufficient, but they can't do much more with a globalized customer base as theirs. Most of my kits are from this company. The company's response to mail is good; they have replaced old decals many times for free. They are always updating their manuals, so you may find something different by the time you build one of these models.