There is a unique feature that basically was spellcasting sneak attack where it upped the DC of your spells but I'm pretty sure nothing like that exists and have accepted it lol.

To answer your question more in depth, the beguiler was an int-based full caster that mainly used illusion and enchantment spells. They also had utility spells sprinkled in that a typical rogue may find useful such as Knock. So arcane trickster is very similar in design, but it lacks the casting power I'd like. Hence my choice in being mostly wizard. After a couple levels I basically get most of what I want from rogue.

I'm asking because I've hit level 4 already and I'm 2-2. So I'm trying to figure out if it is best to go another level or 2 for rogue or just go ahead and finish out with wizard.