Duel Masters

Both are Shounen Card Game Anime with a ton of characters, and a mixture of good and suddenly-popping-up bad art, with crazy hair too! Not to mention, both are for kids. Cardfight!! Vanguard however pays more attention to the story, with characters affected a lot by their pasts and whatnot, more emotion, more..girliness. Cardfight!! Vanguard also has a lot more of an Anime feel to it to the extent of a slightly "moe" main character, a "Kuudere", "Dandere" and later arriving "Tsundere" character included, better art too. All in all, Cardfight!! Vanguard is recommended for anyone who likes Anime like Duel Masters, especially if you're looking for a slightly more mature take on the Card game Anime.  read more 

Both are about dueling to win. Both are about summoning monsters with cards. Both are about friendship and trust. Both are about the heart of the cards. What heart of the cards means is believe in the heart of the cards, the cards will listen to you and you will draw the right card to win. Winning is hard, but winning without the heart of the cards is a Big No No. 

Both a card themed series as well as also focused on spiky hair mcs and also lots of action and decent looking artwork and character designs. 

Both are monster themed card fighting series with lots of action a ya cast with a spiky hair mc as well as lots of decent art and character designs.