Isnt it better to decide it by yourself?
Why don't you make the call?
这其实是个反问句。所以翻译成疑问句不太合适。
有朋友翻译成why don't you decide,其实也行。
老外对做决定的地道一点的说法是make a call / it's your call。
Isn't it good that you make the decision?
it's up to you ,isn't it good?
isn't it great for you to decide?
It' up to you,okay?