Its a toss up between Kamil and Damis imo. Kamil isn't the big problem, but his location (in stat lowering ice) causes issues. Damis drains prayer and needs some good snaring, lots of food, or a partner to be defeated.
well, I have a mounted glory and I use the Lost City slayer master so I normally use money I got from alching to repair mine between tasks. Its pretty cheap when near full.
After killing many bloodvelds and ankou with a ring of wealth and ring of life.... I see no difference. I recommend a RoL because neither of them have incredible drops anyways.