Designing works better in Adalo. Bubble is much more flexible and gives you full control, the downside of it is that you can easily build a crappy application that looks horrible, performs bad and full of bugs.
You’ll probably spend about 2 months on Bubble before you can build a proper application. It helps if you are familiar with Photoshop, HTML and CSS as that was a huge benefit for me coming from a designers background to Bubble.
Understanding how grid containers work in HTML, CSS will help you understand how to position your elements.
Good luck 