Test automation tool selection: a decision tree

Direct answer

Pick the runner first (open-source vs codeless), then the grid (DIY vs hosted), then the layer (visual / API / mobile). For most Series B/C SaaS teams in 2026 the answer is Playwright + BrowserStack + Applitools. The forks below tell you when it is not.

Decision

1. What is the primary surface area of your product?

Branch A

Browser SPA (React, Vue, Angular, Next.js)

Continue to Fork 2A

Branch B

Mobile, desktop, or enterprise package (SAP / Salesforce / Workday / .NET)

Continue to Fork 2B

Decision

2A. SPA: do you want code-as-source-of-truth or a codeless recorder?

Branch A

Code-first — Playwright (or Cypress)

Branch B

Codeless / agentic — mabl or Testim

Decision

2B. Enterprise / non-SPA: are you SAP / Workday / Salesforce heavy?

Branch A

Yes — Tosca, Leapwork, ACCELQ

Branch B

No — legacy .NET / desktop. Ranorex or TestComplete.

Decision

3. Do you need >20 concurrent browsers on real devices?

Branch A

Yes — hosted grid (BrowserStack or Sauce Labs)

Branch B

No — self-hosted runners are cheaper at low concurrency

Decision

4. Is doing nothing rational?

Branch A

Yes — if your Selenium suite is stable and your team is small, do not migrate for novelty.

Branch B

No — you have flake, slow CI, or a new stack. Time to shortlist.

Caveat

What the tree does not answer

The tree is a heuristic, not an oracle. It ignores your CI provider, your hiring posture, and your CFO's tolerance for quote-only contracts. Run the 3-year TCO before signing anything.