Gutenberg has some annoyances/quirks, but if you're starting from scratch and using a modern theme it's not bad by any stretch.
Having been in the position of rebuilding two sites from scratch (one personal, one commercial), they are miles easier to edit and maintain with Gutenberg than they were with 'classic' + a third-party page builder.
For example the way it handles a list block. You can't just make a single bullet point a paragraph. All the list block has to be converted to paragraph blocks, and then re convert the paragraphs to list items.
The biggest pain I have with page builders are related to licensing as most are "bundled" with premium themes, and most clients don't understand that a premium theme isn't a one-time purchase, but is instead an annual service (to enable updates) Typically, the client has to either re-purchase the theme (with the newest versions), or purchase a stand-alone license for the page builder.