Ruby `#to_s` vs `|| ''` benchmark

nil.rb

require 'benchmark'

n = 100_000

Benchmark.bm do |benchmark|
  benchmark.report("#to_s") do
    n.times do
      nil.to_s
    end
  end

  benchmark.report("|| ''") do
    n.times do
      n || ''
    end
  end
end

#        user     system      total        real
# #to_s  0.010353   0.000055   0.010408 (  0.016294)
# || ''  0.006720   0.000058   0.006778 (  0.017595)

string.rb

require 'benchmark'

n = 100_000

Benchmark.bm do |benchmark|
  benchmark.report("#to_s") do
    n.times do
      'string'.to_s
    end
  end

  benchmark.report("|| ''") do
    n.times do
      'string' || ''
    end
  end
end

#        user     system      total        real
# #to_s  0.014510   0.000241   0.014751 (  0.016535)
# || ''  0.011230   0.000124   0.011354 (  0.016319)