Yu-Gi-Oh all the way. I grew up with this stuff and ow I collect so many of the cards. Plus I have at least one card or two that appeared in some of the main characters deck. Like Black Luster Soldier,Red Eyes Back Dragon, Blade Knight, Magician Of Black Chaos, Arkana Knight Joker
yugioh is one of those card games that truly stuck with me. it helps that it also taught me had to do 2 to 4 digit addition and subtraction quickly in my head.
I used to play pokemon, then Yu-Gi-Oh, then Duel Masters, then back to Yu-Gi-Oh. I eventually stopped playing in high school because the only people left who played were honest to goodness mentally handicapped people who just used a big ass 100 or more card deck and thought they could win with that. I've played a little bit of Magic the Gathering in college but I just don't know that many people who play it. There is a gamers' guild that meets on Saturdays but I go home for the weekends.