From my experience the oils, conditioners, shampoos, adhesive removers are very comparible. I agree the red paints blend and match better, but I think that is partially because they dont cover as well. As far as paints go I think Sullivans covers a lot better but I think that is why it is harder to blend and match as well. As far as adhesives there is no comparison in my opinion. Weavers just dont hold, if you have the slightest bit of humidity they just dont set. I think that is what makes them more user friendly for youngsters and newbies. They dont set therefor they are easier to continue to comb through. Sullivans set, and HOLD that is why you cant comb through easier.
On a side note, Sullivans does not give supplies to those big time fitters, they buy them because they are tried and true. Weavers on the other hand are SPONSORING people like Stierwalt and May who sign with them. This means they are giving them money and product. I dont think anyone will ever surpas Sullivans. They are the ones who created the products that others are mimicking, they are also continuously trying to find ways to improve the products they already have. They are miles ahead of other companies when it comes to product development, plus they do so much more to support the youth in the industry.