While Astrix does not have a perfect universe like that of Tintin the level of humour and the complexity of the verbal jokes in Astrix cannot be surpassed. Just take the creative names of the charactersin Astrix as an example.
In Tintin, specially in the later books, it is the story and the interactions between the characters that make the book. In Astrix, a series of hilarious jokes are fitted next to each other along a relatively loose story line.
Also, let us not forget that the magic of Astrix lies 80% in the words, which is mostly lost when translated from French to other languages; while in Tintin almost any frame can be taken out and posted on the wall as a work of art. I love both...
Here is what someone else thinks about Asterix meeting Tintin