It really depends what your goals are. Do you want to be slimmer? Or do you want to be thicker/ wider/ more muscular?
You may have built some muscle, but it takes a long time to build enough for it to be obviously visible.
So if your goal is to look more muscular, keep going. And make sure you are doing progressive overload, perhaps revamp your split or your programme, if you feel progress has stalled. If building muscle is your goal, I would also consider dropping one or both of your cardio days, to do more resistance sessions- you could then switch to PPL maybe

There is not one workout split that is categorically "better". You have to start with your goals, then look at things like how long you can realistically spend at the gym when you go, and how many times a week you can go. The combination of those factors define the best suited split and programme for you.
What you need, no matter the split, is consistency, and progressive overload.