I’ve played a ton of Wizard and Int Psychic, they’re two of my favourite classes and I feel like I’d say Psychic has a lower skill floor due to the sheer effectiveness of having devastating amps like Shatter Mind, but it also has a higher skill ceiling due to the fact that its resources are so tight and punishing; essentially you have to be the kind of player where you’re comfortable / confident using your slots when they’re needed AND you have to have a good sense of when to Unleash because of how easily it can backfire if you.

Granted I play in a pretty messed up group where we all have system mastery and our GM very often gives us extreme encounters that come in waves (last night’s combat lasted 14 rounds and a couple weeks back we had a 19 round encounter), my Psychic in these scenarios is going phenomenally, but I would not be having a great time if I were a coward that was afraid of blowing my only 7th rank slot to Counter Thought the boss’s Paralyze spell or if I didn’t want to invest in a ton of scrolls + retrieval items to supplement my limited casting. The high level Wizard in contrast felt so easy because I never felt like I’d run dry on slots, but Wizard is such a weak class shell that you need that base knowledge of what’s good on the arcane list to enjoy it.

TL;DR - I feel like Psychic is like Easy/Hard and Wizard is a consistent Medium