AuthoredUp is the best fit for people who write their own LinkedIn posts and want formatting, a feed preview and detailed analytics; people usually look elsewhere when they want posts drafted for them, a tool that works outside Chrome, or a library of other people's top posts.
Supergrow is a full LinkedIn content system with AI interviews, voice notes, scheduling, engagement, analytics and team approvals; if you want fewer moving parts, a simpler tool fits better, whether that is a chat that drafts from your notes, a formatting editor for posts you write, or a plain scheduler.
Taplio is a strong fit if you want AI writing, a viral-post library, engagement tools and lead outreach in one LinkedIn dashboard; if you mostly need formatting and analytics, a weekly writing rhythm, a cheap multi-network scheduler, or posts drafted from your own notes, a narrower tool fits better and usually costs less.
LinkedIn's Post Proofreader polishes an English draft you have already written, for Premium Career and Premium Business members only, so it can save you editing time but leaves the hard part, deciding what to say from your own work, with you.
A LinkedIn hook works when it promises a payoff the reader cannot get by scrolling past.