Not 'it depends.' A real decision framework.
I get this question every week. 'Should we hire a fractional CMO or an agency?' The honest answer requires understanding four dimensions: ownership, speed, cost, and accountability.
Dimension 1: Ownership
Agency: Executes campaigns you define. They need a brief. They deliver assets. They don't own the strategy or the results — you do.
Fractional CMO: Owns the strategy, the team, and the outcomes. Sets the direction, manages the execution (often through agencies or contractors), and reports to the CEO/board.
Choose agency if: You have a clear strategy and need execution horsepower.
Choose fractional CMO if: You're not sure what the strategy should be, or your current one isn't working.
Dimension 2: Speed
Agency: Onboarding takes 2-4 weeks. First deliverables in 4-6 weeks. Meaningful results in 3-6 months.
Fractional CMO: Onboarding takes 1-2 weeks. First strategic changes in week 2-3. Meaningful results in 2-4 months — because they cut what's not working immediately.
Dimension 3: Cost
Agency: $5K-$25K/month for a mid-tier B2B agency. Often with 6-12 month contracts. Scope creep is expensive.
Fractional CMO: $5K-$15K/month for 2-3 days/week. Usually month-to-month or quarterly. You get a senior operator at a fraction of a full-time CMO salary ($200K-$350K+).
Dimension 4: Accountability
Agency: Accountable for deliverables (assets, campaigns, reports). Not accountable for pipeline or revenue. If leads don't convert, it's 'a sales problem.'
Fractional CMO: Accountable for revenue outcomes. Pipeline, conversion, CAC, LTV. If it's not working, they change the strategy — they don't just change the creative.
The decision framework
| You need... | Choose |
| Execution on a defined plan | Agency |
| Strategic direction + execution | Fractional CMO |
| Campaign creative at scale | Agency |
| Marketing ops, attribution, systems | Fractional CMO |
| Someone to present at board meetings | Fractional CMO |
| Both strategy and execution? | Fractional CMO who manages agencies |
The hybrid model
The best B2B marketing orgs I work with use both: a Fractional CMO to own strategy and revenue, plus specialized agencies for SEO, paid media, or content production. The CMO manages the agencies. This is the model I run for most of my clients.