For UI//UX, Adobe Xd is a better option, since you can make working prototypes and it's a relatively easy process, as that is what it is made for.
Illustrator or InDesign are not good tools for that, since they produce static results, which you cannot interact with. On top of that, they are not less complicated than Photoshop, if not more. Xd's interface is rather simple and only has the tools you will actually need.
Webflow would be good for making an actual working website, but it does require some coding and HTML/CSS knowledge, and is slower than Adobe Xd. With Xd you also have plugins which have prebuilt elements and it will be much faster to make a wireframe.
Adobe Xd is a prototyping tool, however. So whatever you make is not going to be an actual functioning website or an app, but just a prototype. You can export the visual assets later and you will need development skills to make a working website or app out of them.