Difference between Speed-Transition and Sub-Skip?

Hi there, great scripts!
I'm just wondering what is the difference between your sub-skip script and the speed transition script?
I've been using speed transition for over 2 months and I came across your script and it seems like the functionality is nearly identical.
Just wondering if there are any differences. 

https://github.com/zenyd/mpv-scripts/blob/master/speed-transition.lua