which approach is better?

stat.rb

class Stat
  def initialize(raw)
    @raw = raw
  end

  def file
    @file ||= parse_file_from_raw
  end

  def name
    @file ||= parse_name_from_raw
  end

  private

  # parsing thingies

end

  class Repo
    attr_reader :commits, :log

    def initialize(path)
      @path = path
      @log  = raw_log

      string  = remove_tabs(@log)
      split   = split_commits_by_marker(string)
      commits = create_commits(split)

      @commits = commits
    end

    def remove_tabs(str)
      str.gsub(/\t/, " ")
    end

    def split_commits_by_marker(str)
      str.split('$$')
      str.delete("")

      str
    end

    def create_commits(commits)
      commits.map do |commit|
        Commit.new(commit)
      end
    end

    def raw_log
      Dir.chdir(@path) do
        `git log --format='$$^^%h^^%ct^^%B' --numstat`
      end
    end
  end