Which problem is worse?
One group had millions killed. The other kills millions.
Nail on the head
I wouldn't say islamophobia is a problem.. it keeps more of us alive.
In this country, or elsewhere? Here I'd say Islamaphobia, because Americans are pussies. In the Middle East I'd say antisemitism, because middle easterners are pussies.
One group keeps beheading people.
This isn't an either-or question. Both are terrible. Since Islamophobia affects more people I would say it does the United States more harm in the world fueling hatred for us.