Converting/Editing DVD in FCP7
I'm editing an actor's reel and I have a bunch of DVDs he gave me. I'm using Aiseesoft DVD ripper for mac to convert the dvd files into .mov files, but I'm not sure if I should convert them to HD video or SD video. I did a test and for some reason it looks like the HD video is a little bit better than the SD video, even though I'm ripping from a regular DVD. Is there really a difference in quality?
And when I imported both the SD and HD clips I made into FCP7 and exported them, the SD video has black bars on the sides, while the HD video only has them on the top and bottom. I'd like to know what's the best way to convert DVD files and what sequence settings I should use in FCP 7. Do I convert the DVD to SD or HD? And what sequence settings should I use in FCP? Thanks!
MacBook Pro, Mac OS X (10.6.8)