I have both. As much as I love the DGT, it is my 594 that gets ALL the playing time.
I put TCI 58/15LT Limited pickups in it and changed out the bridge to the OG "flat saddle" bridge (swapped tailpiece for the OG tail that went with the bridge, though I didn't need to). The tuners were swapped for Mannmade vintage lockers. The wiring was redone to match the Core wiring found in Garrett's 2016 Core 594. I had a 2016 at one point, and that's what the 594 should sound like to me - so my SE was modded to match 2016 specs, except the TCI pickups.
I use my 594 tuned to C# standard with 12 gauge strings. It is FEROCIOUS!!!!!
The DGT got (almost) a full "Core" make-over as well. It now sports a Mannmade USA/PRS tremolo, locking tuners, upgraded wiring and plastics. The only thing that I kept stock were the pickups. They actually sound AMAZING. I felt no need to change them. The electronics were modified so that the volume pot positions were swapped - the neck vol is first, the treble second. Both vol pots pull to split the coils of their respective pickups.
It is a beast. And, in all truthfulness, I prefer it to the Artist Package DGT I had before. The AP had a weird high-end "ping" to the tone I hated. i have attributed that to the Brazilian Rosewood. Not a fan of it - or Ebony for that matter. I hear something in the tone that I don't hear with Indian Rosewood or Maple.....