Puree is a strange thing...I always look at the ingredients listed on the labels when buying puree.Some do list,"Tomato concentrate or paste,water,salt,citric acid" or whatever is in there they add. I have tried some brands and was never happy with them.
The Purees made straight from tomatoes or tomato pulp has been much more flavorful for using as a base to build a sauce.Always look at the label and know what you are testing out.
For example,Red Gold,makes a Puree I tested,that list ingredients as,Tomato concentrate (water, tomato paste), citric acid.
You can see the label here:http://www.redgold.com/red_gold_company/foodservice/resources/nut_106_tom_pur_1.pdf
I am not telling anyone that this is bad or not to use it,I'm saying for ME,I do not care for Purees made with concentrate,water and paste.It just never tasted right for me for a pizza sauce base.
Also,Red Gold and Red Pack are made by the same company.I have tried a Red Pack fully prepared pizza sauce,and was not too pleased with it on my pizzas.
Listed in the ingredients are : Tomato concentrate (water, tomato paste), high fructose corn syrup, salt, corn syrup, soybean and
olive oil, spices, citric acid, natural flavors.
This is just one example of Pureed/ready sauce I tried,and like many others,I do not care for a concentrated base to begin with,and on top of that,don't care for that high fructose corn syrup added,or soybean oil either.
If someone likes it,thats fine,its just not for me or my pies.I'm not telling anyone not to try it if they haven't yet,do try it out,find what you like.My money spent,I test,compare,and keep looking for new products to try and test.Yet for me,just about anything these days with paste and water is revolting to taste out of the can,and after trying it out on a pizza,I wont use it again.