It's entirely up to you which you use. If you're experienced with both, event sheets and JavaScript code still have their own strengths and weaknesses. For example in my Command & Construct game project, I mostly used JavaScript coding, but I still used event sheets for the menu systems, because it's quicker and easier than having to write code for a menu system.
honestly I want to do the hardest thing and that allows me to do more. That's why I thought that javascript (at least I think) is the basis of Construct3, i.e. if so, maybe with javascript I could create a program identical to Construct3?
Perhaps it would take too much work time considering that Construct3 was made by a team maybe years of work.
But the point is that javascript is at the core, so learning that (even if it takes a long time) when I've learned it I'll be able to do everything I did with Constrcut3 anyway. And maybe much more and faster.
You talked about strengths and weaknesses, what are the weaknesses of javascript?
I'm following a video tutorial course for javascript (and also html and css), and it seems to me that in terms of organization, variability of elements, it's more efficient.
with javascript can I do everything I do with Construct3? Like making a spaceship that moves etc...? My games are Anime style, I like to put artistic images and it's animated, but I'm not interested in big special effects like 3D.
If you want I can put the link of a free video game that I made and published on the play store, to give you an idea of how I want the style of my games to be, even if my game is still incomplete and scarce in terms of content (not to mention of so many bugs there are).