@twins4heaven For me it was Gymnastics. I loved it, it's an impressive sport (though it was always seen as girly when I was younger) but it's an incredibly rewarding sport. It is one of the hardest sports if not actual contender for the top one. You need to be almost athlete levels to get almost anywhere with it.
It's great as well because although progress is slow, it's very build from the ground up and a lot of skills that you don't think you will be able to do are just progressions of basic skills. For example you say doing a one hand cartwheel - this is fairly basic and you will be able to do this shortly after achieving perfect form of a basic cartwheel and from this a no hand cartwheel (aerial) is simply a matter of practice and not really that hard it is simply determined by practice. Practice looking at a specific spot on the floor, practice making sure you push UP as much as possible (a lot of people see a lot of sideways motion and think of it like a vault, it's actually based on a jump up from one leg as high as possible to give you time to wheel your legs over).
I always found it incredibly rewarding as there's always a new skill to learn and it's usually based on one you know. You get
so close for so long and then you finally nail it. It's a great pay off for hard work.
The downside of gymnastics is that it's incredibly regimented and time consuming. You need to put in the time, and you need the maintain your endurance for long training sessions, patience to do ridiculous amounts of drills, keep your flexibility and strength up, and still be working on a progression of a skill. Very few people have the time needed in gymnastics to see significant results. As you've mentioned you like other sports this might rule it out for you, it's a very time consuming endevour and will swallow time for other activities.
Ballet is not something I'm familiar with but I understand it's quite similar. Solid foundations, progressions, working on perfect form before moving on but I don't think it's quite as punishing on downtime/requiring constant drills as long as you stay quite fit (it's another pass time that requires an athlete level of fitness).
Aerial silks I have no experience with, but I assume from what I've seen it's similar to ballet. Probably the least "all consuming" of the three, but I really don't know.