What is the difference between TV series complete box set and complete collection box set?

This questions is in regards to ANIME. I want to buy complete series of some shows, but its showing “TV Series Complete Box Set” and the “Complete Collection DVD box set”. The prices are difference, but when I look at the info, it still the same. They both have the same amount of episodes, and are made by the same company. The only difference is the suffix to the tittle which I mentioned above.