Soulknife vs. Arcane Trickster

Hi all. First time playing DND since 1994/2E so lots to learn. We are rising in our campaign from 2nd to 3rd level and it’s time to decide if my Gnome Rogue is going to be a Soulknife or an Arcane Trickster. I’m leaning towards Soulknife.

My stats (rolled):
Str 10 Dex 18 Con 10 Int 12 Wis 16 Cha 16

Background is Charlatan with the skilled feat.
My skills are acrobatics, athletics, deception, insight, investigation, perception, persuasion (E), sleight of hand and stealth (E).

The DM is also new and he’s very reasonable. He has agreed to scale the damage of the Psychic Blades with my Psionic dice (d6->d8->10->12), give them progressive +1/2/3/4/5 to keep up with magic weapons of the party, as well as let me choose each turn whether to use the Nick or Vex properties to preserve my bonus action. These were all of the main complaints. I read about the sub class. Is there anything else I should request?

Otherwise, from everything I’ve read the arcane trickster is also a lot of fun to play. Is there anything I should ask for for this subclass to keep it equivalent to other classes?

Our goal is fun, not just max DPR. Would love some opinions…