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Semrush for comprehensiveness, cost, rate of development, open roadmap and responsiveness of product team ( I think I know all by name now). I also think at pace they are going they will incorporate more off functions from smaller too.
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varvy and dareboost - comprehensive tools finding page speed issues
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ranks.nl - valuable tool to analyze keywords, prominence and semantic usage
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copyscape and site liner for dupe content issues
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urlprofiler and screaming frog
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search console for queries, keywords, serp ctr and internal linking
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ahrefs and majestic for back links - unfortunately I can't recommend OSE anymore
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Google sheets, Supermetrics and xpath
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Annie Cushing checklists for audits
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Moz forums and wbf
