I have read the manga, but only the first couple of issues so bear with me.
In my opinion, the manga is VASTLY superior to the anime. In the mangas I read, there was NO mention of Duel Cards or anything of the sort. Usually, some criminal does something, and Yugi transforms into his alter-ego and plays a twisted sadistic game with them. It is in my opinion very interesting and awesome, unlike...
"Ha! I play this card! You can't defeat it!"
"Oh no! But wait! If I play this card..."
"You can't play that card because blah blah blah!" or "Ha ha ha! You can play that card but it won't do you any good!"
"Yes, but if I do this..."
"What?! Oh no! My ultimate monster!"
(Repeat for fifty more episodes)
That's just my opinion, which doesn't seem to count for much on this site.