Hulk has gone through some many iterations and tweaks over his... what, 60 years in the public eye?

I'd say the most dangerous mentally Hulk is likely the Devil Hulk, who's running around in The Immortal Hulk. Funnily enough, he's Banner's innate desire for a father figure. But because of his horrible childhood, Banner and EVERY Hulk instinctively distrust father figures. Devil Hulk can smell the lies of men, damage or even cause lethal damage to divine beings and has an instinct for everyone he runs into. During a tussle with the Avengers a while back, he was able to psyche out She-Hulk, comparing her current state to what the world fears about the Hulk. Also, the Devil Hulk's stated desire is to 'End the World', so Hulk can finally be alone.

Also, Immortal Hulk has tons of body horror, taking a critical eye to comic book death and how horrific it is for the people coming back and their loved ones. I like the book quite a bit.