I would buy the DS and the 3DS versions because they seem different. The DS version seems specially made for the DS with JRPG like characters. Kinda like The Eye of Judgment for the PSP . However, the 3DS version seems to have the same characters from the PS2 version of Culdcept.
Love the card art in Culdcept. They are made by some Famous JRPG and Action game artist. I know the dude that did the art for Batman Dark Tomorrow and Final Fantasy is one of the artist for the game. Some tough gameplay and camera angles, but BDT had some great character art. --- James Bond 007 in Never Say Never Heineken AND You Only Live Miller High Life .... Twice. : )