What are the best treatments for Evans Syndrome?

The best treatments for Evans can be different for every patient. It's why it's a tricky condition to manage.
First line treatment is usually steroids and they can help many patients. IVIG is common early on too, especially if platelets are low. Blood transfusions to help manage the haemolytic anaemia can give pretty quick relief but does nothing to stop the cell deaths. It can however keep you alive long enough to try other treatments in the case of a severe relapse. And if a relapse is mild occasional blood transfusions might be enough to keep the symptoms manageable.
Rituximab is probably the next treatment that is tried most often here. For some people it will cause remission. It didn't for me.
The next line of treatment for me came down to chemotherapy or a splenectomy. I decided on a splenectomy at the recommendation of the experienced department head of haematology/oncology overseeing my care. Because I'm young, the splenectomy has (we think) a greater chance of long term success and a better side effect profile.

If all of these treatments fail, the very last option is a stem cell transplant. It has a high risk of death. If people live, they're cured though as their immune system is effectively replaced. It's highly experimental and highly lethal.