You probably want to go on Zytiga First, unless you have a heart condition. It’s better to go to Zytiga first then Darolutamide. Here is an article that discusses it. They talk about Enzalutamide but it is essentially the same as Darolutamide in how it works.
https://www.thelancet.com/journals/lanonc/article/PIIS1470-2045(19)30688-6/abstract?mc_cid=c2dca8aa74&mc__eid=99575fc699