Does anyone know of a good video editor to create videos in SC story format?
Splice and Pocket video have worked well for my instagram stories…which as we all know is a similar format.
I have also heard Apple Clips is good if you are using an Apple device.
Personally I use Filmora, which is quite basic but it does everything I need. They have a free trial version (with watermark) so you can try it out before paying for it. 
I have used Splice previously and currently using Filmora Go which is much better!
KineMaster is what I use 
My favorite tool is a video cutter and editor called Joyoshare VidiKit. It is a video toolbox that has a video cutter, joiner, converter, recorder, compressor, watermark remover, player, repairer, and more. It is very easy to use. I like it so much. Maybe you could give it a shot.