The key reasons to buy the DVD Collection is the superior audio and video compared to any version, including the 3 full-length commentaries. Not to mention the 3+ hours of extras.
I don't know what else could convince you?

But if you mean the chronological "Trilogy" boxed set, then no, this is different - these are the 3 standard films, the way Coppola intended them to be told.
JG