I've got two arrays with identical elements in different orders that I need to compare and the order doesn't matter. Should I use sort or array subtraction?

results.txt

Rehearsal --------------------------------------------
sort       1.140000   0.010000   1.150000 (  1.166011)
subtract   0.610000   0.030000   0.640000 (  0.672543)
----------------------------------- total: 1.790000sec

               user     system      total        real
sort       1.240000   0.010000   1.250000 (  1.254706)
subtract   0.620000   0.030000   0.650000 (  0.672024)

sort-vs-subtract.rb

require "benchmark"

sort1 = (1..1_000_000).map { rand }
sort2 = sort1.sort

subtract1 = (1..1_000_000).map { rand }
subtract2 = subtract1.sort

Benchmark.bmbm(7) do |x|
  x.report("sort") do
    raise "mismatch" unless sort1.sort == sort2
  end

  x.report("subtract") do
    raise "mismatch" if (subtract1 - subtract2).any? && (subtract2 - subtract1).any?
  end
end