Thats a tricky subject , in my opinion. A lot of different factors come into it. Am I correct in saying your ED display will be capable of 480p and or 576p, that depends on where you live. Say U.S.A.
If your DVD player outputs true Pal and true NTSC, not pal to ntsc conversion or the other way, type players. Players that convert do not always do a good job.
In the real world, a nicely pressed Pal disc theoretically should beat an NTSC. But this does not happen much.
But I come from Pal land , a lot of Pal discs are actually imposters . NTSC posing as Pal. My earlier model Pioneer DVD actually lights up on the display telling you that the disc is NTSC , when the DVD cover states PAL Region 4 all over it.
I have found that some discs are better than others, NTSC has improved 100% on what was shown on laserdisc ( the colour seems truer, no funny reds, or flickering ) but this is my opinion. I have about 90% ntsc and 10% Pal.
For example, heres a few I have noticed differences,
region 1 version of The Mummy ( Brendan Fraser ) is awful , but the Pal one is excellent.
region 1 of The Jolson Story is excellent , but the PAL version is really awful.
Disney animation Region 4 Pal are nothing marvellous , but NTSC are perfect.
All of the newer Region 1 titles are excellent now , some even look like HD.
I know I may be opening a can of worms by saying all this, but this is my opinion of course.
I hope by now you have not fallen asleep by me rattling on , but this could go on for years comparing discs.
I hope this a may have been a help, and not a hindrance.