The cheapest data in the category
Ubersuggest earned its audience on price. Keyword ideas, basic competitor research, a site audit and rank tracking start at $29/month, and the one-time lifetime plans starting around $290 undercut every subscription in SEO. For a solo founder that is a rational purchase and we are not going to talk anyone out of it.
The trade is depth. The index is smaller than Ahrefs or Semrush and the numbers are directional rather than precise. For most small sites that is fine, because the decisions being made are which three pages to write, not which of two near-identical terms wins by 40 searches a month.
These two are not really competing
Ubersuggest answers what should I write about. PostWyse answers who is going to write it. Plenty of people run both, and that is a reasonable setup: cheap research feeding an agent that drafts, scores, and schedules.
The reason Wysera comes up in this search at all is that some people buy a research tool hoping it will fix an output problem. If your keyword list is already longer than your published-pages list, another research subscription is not the missing piece.
Where Ubersuggest wins outright
Price, and the lifetime plan in particular. There is no subscription in this comparison that beats paying once. If your need is genuinely just keyword ideas on a tight budget, buy it and spend the saved money elsewhere.