Are the Best Book Publishers for New Authors Truly Worth Partnering With?

I’ve been looking into the best book publishers for new authors and wondering if they actually provide the right support for beginners. Many claim to help with editing, marketing, and distribution, but it’s hard to know which ones really deliver. For those who’ve worked with the best book publishers for new authors, did they help you gain recognition and sales, or did you face challenges that made you consider self-publishing instead?