It's up to you, Steam version will be different due to I can only use MZ sprites for the sample project. You can wait till the trailer for Steam version drops and maybe see which version you like best and decide later.
Viewing post in Should I wait to buy until its on the Steam Page
I'll wait till I get more underway with my project all I have is a rough storyboard atm, I just saw your video and that you wanted your Action Combat System to be the first plugin available on Steam. On another note I wouldn't worry about what anyone says in regard to the price of your plugins, RPG Maker MZ is starting to become a more serious platform for Indie Games and as it does professional grade tools will become available that are price accordingly. I personally think they are priced very fairly and leagues above the competition.