well it depends whats you mean by rewarding as in more combat equipment or money or what
It also depends on if you are f2p or p2p. In f2p the fist of guthix is a rewarding way to get your magic xp up for free. Also Bounty hunter crater is perfect for a lvl 45 with rune 2h.
I say go try bounty hunter , it will be the best for you. (also if you die in bounty hunter you lose everything , its just like pvp. Except people up to 55 can only attack you.