Start with core blocks
WordPress itself includes the block editor and site-editing capabilities depending on your theme. That is the baseline against which third-party free builders should be compared.
Check upgrade pressure
Before adopting a free tier, identify which features are paid and whether you will need them for headers, templates, forms, dynamic data or client work.
Cost of switching
A free builder is expensive if you rebuild the site six months later. Pick for likely 2–3 year needs, not only today’s invoice.
When paid Divi can still make sense
If you need one builder across many sites, unlimited-site licensing can make a paid tool economical even when free single-site options exist.