If u have a bigger screen that's greater than 32".
And a decent home theater system greater than $250. A blu ray player is recommended.
Else a dvd would be better.
Blu-ray is higher technology, more data, higher resolution, and higher price for the same films on disc. I recommend that you treat it like new release movies. The ones that you'd like to see in the theater because of the graphics, effects, and action scenes-get the Blu-ray Disc. The films that would make you say, "I'll wait for the DVD to come out"- save the money and get the DVD, it will satisfy the same. Don't worry about purchasing DVDs, Blu-ray has "planned obsolescence" also. To simplify, Blu-ray is better, and it costs more.