When building your WordPress website these two choices will have a huge impact on your ability to manage and maintain the content and it's display.
In this video I cover my recommendation for the theme and also the page builder.
Theme is something that will take a lot of time and energy initially to configure the colors and layouts. So, picking the right theme one from the start is going to be critical.
The page builder is something you actually have to learn to use properly, and it takes time as you jump in and start creating content.
Learning to figure out the minor nuances as and when the need arises means the page builder is not something you want to keep switching.
The other issue with switching theme and page builder is the formatting of your older content will be impacted so it is something you want to be really careful about from the get go.