I tried the Sushi Box UA this week via monitor as you did, but I have not tried running out of my Markbass DI. But I don't really care for the DI out of the Markbass EVO 1.
I am getting great sound out of the Sushi Box UA, but I am still learning and curious about the Neptunium or Nobelium. Would one of them sound more like a Noble or REDDI? I have the Universal Audio Solo 610 at home, and I love it! But it seems like a never-ending tone search, trying to get that studio tube sound in a pedal that would not be a Noble.