The systemic type would be the one most likely to require the child to be in the hospital, especially when the condition first starts. I have also heard about Ankylosing Spondylitis. In contrast to rheumatoid arthritis, AS is more common in men. There are groups of arthritis that are seen in spondylitis and the group name is spondyloarthropathy. The Arthritis Foundation has a good references or a standard medical textbook can go through some of the finer points of the spondyloarthropathy conditions.
Treatments are similar.
Again, it would be decided on an individual basis. Another point to remember is to not give up. If one treatment does not work, make a plan and try another treatment. Be persistent with the person taking care of your arthritis and agree on whether or not the treatments are working or whether or not they are right for you. I am a big believer in people participating very actively in their treatment.