I haven't noticed a difference in Taco seasoning. I think they are pretty similar. As for enchilada seasoning I don't really like seasoning packets. It's so easy and inexpensive to do your own with tomato sauce and spices. You should try it. The kind of seasoning I put in my own are chili powder/garlic powder/pepper etc. but what really makes it good is cummin.
Hope this helps.
