smartphone editing

Its been a few years, phones are getting crazy. Anyone making quality stuff for youtube yet?
I just got a new iphone, cheaper than a crazy editing rig.
I used iMovie a while back.. got about 5 minutes into an edit the other day however, and it doesnt stop bugging out with desync and some other things making the video not render properly.
So Im looking for some good apps. I found one thats pretty good but to remove the watermark I have to pay 5$ ..normally Im cool with that, but its a bundle monthly subscription, So I dont think Ill be doing that. Even if I did shell money Im not gonna pay monthly for no watermark, I dont even need features. Something with multi track, ability to split audio from video and no watermarks. Does it exist?

So update.. so far Im thinking of purchasing a few things. pinnacle studio has an app, I remember their software being decent on PCs anyway.
I also tried out Adobe Rush CC for iphone. Adobe had some effects and filters I didnt really mess with yet. You have to purchase adobe after three renders.
It runs and renders pretty well though, came up with this:
https://youtu.be/gav3IClJkqU
https://youtu.be/gav3IClJkqU