Aran is the best designed class in maplestory, and here is why.

Aran used to be my favorite class before i made a DS. I loved its unique combo system and the fact that you actually had to pay attention to play it, rather than just spam a key like most other classes. The revamps made it even better, with gorgeous looking skills and the awesome combo recharge skill. I only ever had 2 problems with aran: first, that idiotic rolling spin skill that pushed monsters away, when what you needed is to keep the monsters close at hand to keep your combo counter up, specially at first, when you lost it super fast. second, i always found it conflicting that keeping a high combo count increased your att, but you had to reset it to use any skill.

Then came DS, and I fell in love. To be fair, I liked it even before I knew how the class worked; the awesome looking skills, the badass looking character, and the fact that it was a friggin demon. Then i experienced the mechanics of the class and liked it even more. For me, the DF system worked kind of like the combo system, but way easier to fill up, and as JoeTang mentioned, you get rewarded for spending it rather than sacrificing attack like on Aran. This, combined with the ridiculous mobility and the fact that they're friggin tanks, made this my new favorite class.