Honestly both decisions are totally up to you and it seems you're already taking things step-by-step.
For airs, as long as your jump technique is extremely solid, it's fine to go to either medium jumps or 180s next, either is one step up so there's not really a wrong choice either way.
For jibs, it's up to you again, both are logical next steps. You're basically asking if you should learn boardslides on the small jibs first or advance your 50/50s one step further to slightly more advanced boxes/rails.
Neither is a wrong choice, just depends on which skill you want to prioritise. Either way, no matter what you choose it seems you're keeping your skills and progression fairly balanced so you're doing things right already.