So let us start with Christianity since it claims to be the older religion, which in reality it is not.
Christianity began in the Middle East as a religion under the authority of the Romans, but when Rome became the Roman Catholic Empire it unleashed a wave of hell upon this earth like no other society.
Both much of the Middle East and Europe were forced under the yoke of the Church, parts of North Africa as well, as the European Christians moved across the Atlantic they subdued the whole of the Western hemisphere for Christianity through violent, and terrible warfare.
With the colonial age missionaries spread the christian doctrine under the protective shield of occupation, south saharan Africa being an excellent example.
Australia is one of 4 continents subdued by Christianity, not one continent has been subdued by Islam and Muslims NOT ONE.
Parts of Africa yes, parts of Europe yes, parts of Asia yes, but every continent has felt the sting of the Christian whip.
So when we compare these two religions, it's a no brainer Christianity has been more violent, and destructive, the fact that so many Christians vent on this forum is because they have a guilty conscience and they need someone to blame to keep the attention off of themselves.
They have run into a wall with Islam and they can't get over it, and that is the gospel truth.