Easiest yes. But a jump to the metline at Baker Street (bit more complicated) or Finchley Road (you arrive on Platform 2, walk across the platform you arrive on and take any train from Platform 1) would usually shave a few mins off against the many more stops on the Jubilee. But agree for someone who isn't familiar with the system the simplicity of the direct Jubilee tube would be a big bonus against the potential disaster of taking the wrong train from Marylebone...