These aren't just different price points on the same product — they're structurally different ways of getting security work done, with real tradeoffs in each direction.
Engagements at large firms are typically staffed with junior associates working under partner or senior-manager oversight. This structure can offer real brand recognition and broad bench depth across many specializations under one roof.
But it often means less direct access to senior expertise for a given engagement's actual price point — you may be paying premium rates while the day-to-day work is performed by someone earlier in their career, with senior review happening at a summary level rather than hands-on involvement throughout.
A marketplace model connects you more directly with the specialist actually doing the work, scoped tightly to the specific gap you have, without the overhead of a long-term retainer or a layered account management team standing between you and the person doing the analysis.
This tends to mean faster turnaround and more direct communication, since there are fewer intermediary layers between the client and the actual work being performed.
Very large, highly regulated enterprises sometimes genuinely need the scale, standardized process, and broad simultaneous capacity that a big firm offers, particularly for complex, multi-workstream engagements spanning many business units at once.
Most small and mid-sized businesses get more direct value, faster, from a scoped, on-demand engagement matched precisely to their specific need, without paying for organizational overhead that doesn't actually serve their situation.
Not inherently — thoroughness depends on the specific specialist and scope of the engagement, not the size of the company name on the invoice. A well-scoped marketplace engagement with a genuinely senior specialist can be more thorough than a poorly-staffed big-firm engagement.
Occasionally, particularly if you specifically need a globally recognized brand name for external stakeholders (like investors or specific regulators), but for the underlying technical work itself, that's usually not the deciding factor.