Ayon Stratos or S5?

Can anyone chime in on this thread?   Trying to chooses between the two.  I want a great DAC and Preamp   I believe the S5 is a couple of dollars more than the stratos.  Is this because it has the same DAC and Preamp and an added streamer?  Would also like to ask if I went with the Stratos or Stealth, would the Roon. I keys be an adequate streamer?   Thanks!