Not tried many, but the best so far is Knorr Chicken Broth Mix. I have to get this one from the Asian isle, it's not in with the rest of the stuff. It's a 1kg tub with Chineese (I think) writing on it. I would prefer if it was less salty (first ingrediant) but the flavor is otherwise good and no parsley or fake yellow color.
I really like Bovril liquid for beef. It's got a nice flavor, and a great dark color.