I like them both. The 83-90's versions were a young persons guide to life's rewards and pitfalls. Set in a anthropormophic universe. The 21ST Century surreal version; still carries the same theme. Some elements are the same, with some minor differences. Ian instead of Uncle Harry is a good example. Time will decide; if Miss Miller appears in this universe.
I prefer the cartoon version. You can't beat the classics! >u< Of course, I like the CGI version as well- the 2007 movie is what got me into Alvin and the Chipmunks in the first place! :) Well, they're both cute, and funny and all that jazz. The cartoon version is my favorite, though. ;)