Which is better to write when use expect{} on rspec

expect_sample_spec.rb

# I'm wondering which is better

# ex1: in it ".." block
describe "#create" do 
  it "should create an item" do
    expect { Item.create(:name => 'foo') }.to change{Item.count}.by(1)
  end
end


# ex2: in specify  block
describe "#create" do 
  specify {
    expect { Item.create(:name => 'foo') }.to change{Item.count}.by(1)
  }
end