As an admittedly female viewer I find Akagi far sexier than Kaiji. However, this was the only thing I liked about the show Akagi.
I'm much more attracted to calm collected smart guys than rebellious crazy pussies. But they're both pretty sexy on their own.
Honestly I don't get why people like Akagi so much. The plot is as exciting and interesting as watching chess, but 10 times harder to follow. Kaiji may be a bit less intelligent and a lot more cliche, but at least it's exciting and a lot less predictable.